Patents by Inventor Timothy I. Salsbury

Timothy I. Salsbury has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10401843
    Abstract: A control system is configured to operate a plant to achieve an optimal value for a performance variable of the plant. The system comprise a feedforward controller configured to receive a measurable disturbance to the plant and generate a feedforward contribution to a control input to the plant using the measurable disturbance. The system also comprises an extremum-seeking controller configured to receive the performance variable from the plant and generate an extremum-seeking contribution to the control input to drive the performance variable to the optimal value. The system further comprises a control input element configured to generate the control input by combining the extremum-seeking contribution and the feedforward contribution and provide the control input to the plant.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: September 3, 2019
    Assignee: Johnson Controls Technology Company
    Inventors: John M. House, Timothy I. Salsbury
  • Publication number: 20190250647
    Abstract: A system for monitoring and controlling flow rate of a fluid through a valve is disclosed. The system includes a flow rate sensor to measure the flow rate of the fluid through the valve, and a controller. The controller is configured to receive the measured flow rate from the flow rate sensor, and determine if the measured flow rate is equal to a predetermined flow rate value. The controller is further configured to, in response to a determination that the measured flow rate is equal to the predetermined flow rate value, determine a minimum valve position threshold (xmin). Additionally, the controller is configured to determine a minimum flow rate threshold (ymin) corresponding to xmin, and configured to generate a PWM signal and calculate a corrected flow rate (?f) using the PWM signal. The controller controls a valve operation using ?f. The PWM signal switches between zero and ymin.
    Type: Application
    Filed: February 28, 2018
    Publication date: August 15, 2019
    Inventors: Carlos Felipe Alcala Perez, Kirk H. Drees, Timothy I. Salsbury
  • Patent number: 10365001
    Abstract: A HVAC system for a building includes a plant and a plurality of single-variable extremum-seeking controllers (ESCs). The plant includes HVAC equipment operable to affect an environmental condition in the building. Each of the single-variable ESCs is configured to perturb a different manipulated variable with a different excitation signal and provide the manipulated variables as perturbed inputs to the plant. The plant uses multiple perturbed inputs to concurrently affect a performance variable. The single-variable ESCs are configured to estimate a gradient of the performance variable with respect to the each manipulated variable and independently drive the gradients toward zero by independently modulating the manipulated variables.
    Type: Grant
    Filed: October 3, 2016
    Date of Patent: July 30, 2019
    Assignee: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, John M. House
  • Patent number: 10364997
    Abstract: A controller includes a communications interface configured to provide a control input to and receive feedback from a plant. The feedback is representative of a response of the plant to the control input over a response period. The controller further includes a time constant estimator. The time constant estimator calculates a normalized variable based on the feedback, each value of the normalized variable representative of the response of the plant at a different time during the response period. The time constant estimator calculates a plurality of time constant estimates, based on the plurality of values of the normalized variable. The time constant estimator determines a maximum time constant from the time constant estimates. The controller further includes a control input generator that generates the control input for the plant using the maximum time constant. The control input affects a variable state or condition of the plant.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: July 30, 2019
    Assignee: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, John M. House
  • Patent number: 10352576
    Abstract: 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.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: July 16, 2019
    Assignee: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, John M. House
  • Patent number: 10324424
    Abstract: A control system for a plant includes a controller and a sensor. The controller is configured to estimate a response time of the plant and adjust a sampling rate based on the estimated response time. The response time is a parameter that characterizes a response of the plant to a disturbance. The sensor is configured to receive the adjusted sampling rate from the controller, collect samples of a measured variable from the plant at the adjusted sampling rate, and provide the samples of the measured variable to the controller.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: June 18, 2019
    Assignee: Johnson Controls Technology Company
    Inventors: Carlos Felipe Alcala Perez, Timothy I. Salsbury
  • Publication number: 20190178511
    Abstract: 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.
    Type: Application
    Filed: September 24, 2018
    Publication date: June 13, 2019
    Applicant: Johnson Controls Technology Company
    Inventors: Nathan M. Zimmerman, Michael J. Ajax, Nicholas S. Van Derven, John M. House, Timothy I. Salsbury
  • Patent number: 10317856
    Abstract: A control system for a plant includes a controller configured to detect a disturbance in the control system. In response to detecting the disturbance, the controller is configured to evaluate a signal affected by the disturbance to estimate a response time of a plant. The response time is a parameter that characterizes a response of the plant to the disturbance. The controller is configured to adjust an operating parameter used by the control system based on the estimated response time. The controller is configured to use the adjusted operating parameter to generate and provide an input to the plant.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: June 11, 2019
    Assignee: Johnson Controls Technology Company
    Inventors: Carlos Felipe Alcala Perez, Timothy I. Salsbury
  • Publication number: 20190154289
    Abstract: Disclosed is a system to control a climate of a space via a first control loop and a second control loop interacting with the first control loop. The system includes a first controller of the first control loop to generate a first control signal based on a first modified set point and a first feedback signal. The system further includes a second controller of the second control loop to generate a second control signal based on a second modified set point and a second feedback signal. The system further includes a decoupler configured to predict a first effect of the first control signal on the second control loop and a second effect of the second control signal on the first control loop, and generate the first modified set point and the second modified set point to reduce the first effect and the second effect.
    Type: Application
    Filed: January 22, 2019
    Publication date: May 23, 2019
    Applicant: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, Carlos Felipe Alcala Perez, John M. House, Christopher R. Amundson
  • Publication number: 20190146423
    Abstract: A plant includes equipment that operate to affect a variable state or condition of the plant in response to a control signal. A feedback controller monitors a process variable received via a feedback signal from the plant and uses an error signal representing a setpoint error between the process variable and a setpoint to generate the control signal for the plant. An exponentially-weighted moving average (EWMA) calculator generates EWMA values based on the setpoint error. A normalized index generator uses the EWMA values to calculate a normalized performance index. A threshold generator generates a threshold based on a first alarm parameter ? representing a normalized magnitude of the setpoint error and a second alarm parameter ? representing a normalized duration that the setpoint error has persisted. An alarm manager generates an alarm in response to the normalized performance index crossing the threshold.
    Type: Application
    Filed: December 21, 2018
    Publication date: May 16, 2019
    Applicant: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, Carlos Felipe Alcala Perez, Michael J. Ajax
  • Publication number: 20190137952
    Abstract: A self-configuring extremum-seeking controller includes a dither signal generator, a communications interface, a phase delay estimator, and a bandwidth estimator. The dither signal generator identifies a stored dither frequency, generates a dither signal having the stored dither frequency, and uses the dither signal to perturb a control input for a plant. The communications interface provides the perturbed control input to the plant and receives an output signal from the plant resulting from the perturbed control input. The phase delay estimator estimates a phase delay between the output signal and the dither signal. The bandwidth estimator estimates a bandwidth of the plant based on the estimated phase delay. The dither signal generator updates the stored dither frequency based on the estimated bandwidth.
    Type: Application
    Filed: January 7, 2019
    Publication date: May 9, 2019
    Applicant: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, John M. House
  • Patent number: 10253997
    Abstract: Disclosed is a system to control a climate of a space via a first control loop and a second control loop interacting with the first control loop. The system includes a first controller of the first control loop to generate a first control signal based on a first modified set point and a first feedback signal. The system further includes a second controller of the second control loop to generate a second control signal based on a second modified set point and a second feedback signal. The system further includes a decoupler configured to predict a first effect of the first control signal on the second control loop and a second effect of the second control signal on the first control loop, and generate the first modified set point and the second modified set point to reduce the first effect and the second effect.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: April 9, 2019
    Assignee: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, Carlos Felipe Alcala Perez, John M. House, Christopher R. Amundson
  • Patent number: 10209684
    Abstract: A self-configuring extremum-seeking controller includes a dither signal generator, a communications interface, a phase delay estimator, and a bandwidth estimator. The dither signal generator identifies a stored dither frequency, generates a dither signal having the stored dither frequency, and uses the dither signal to perturb a control input for a plant. The communications interface provides the perturbed control input to the plant and receives an output signal from the plant resulting from the perturbed control input. The phase delay estimator estimates a phase delay between the output signal and the dither signal. The bandwidth estimator estimates a bandwidth of the plant based on the estimated phase delay. The dither signal generator updates the stored dither frequency based on the estimated bandwidth.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: February 19, 2019
    Assignee: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, John M. House
  • Publication number: 20190041077
    Abstract: 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.
    Type: Application
    Filed: August 1, 2018
    Publication date: February 7, 2019
    Applicant: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, John M. House
  • Patent number: 10197977
    Abstract: A setpoint alarming system includes a feedback controller that monitors a process variable provided as a feedback signal from a plant and uses an error signal representing a difference between the process variable and a setpoint to generate a control signal for the plant. The plant uses the control signal to affect the process variable. The system includes a normalized index generator that uses the error signal to generate a normalized performance index for the plant. The system includes an expected value estimator that estimates a value of the normalized performance index expected to occur when a setpoint error of a predetermined magnitude has persisted for a predetermined duration. The system includes an alarm manager that compares the normalized performance index to the expected value and generates an alarm in response to the normalized performance index dropping below the expected value.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: February 5, 2019
    Assignee: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, Carlos Felipe Alcala Perez, Michael J. Ajax
  • Publication number: 20180363932
    Abstract: Disclosed is a system to control a climate of a space via a first control loop and a second control loop interacting with the first control loop. The system includes a first controller of the first control loop to generate a first control signal based on a first modified set point and a first feedback signal. The system further includes a second controller of the second control loop to generate a second control signal based on a second modified set point and a second feedback signal. The system further includes a decoupler configured to predict a first effect of the first control signal on the second control loop and a second effect of the second control signal on the first control loop, and generate the first modified set point and the second modified set point to reduce the first effect and the second effect.
    Type: Application
    Filed: June 16, 2017
    Publication date: December 20, 2018
    Applicant: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, Carlos Felipe Alcala Perez, John M. House, Christopher R. Amundson
  • Publication number: 20180356111
    Abstract: A thermostat for transmitting data wirelessly to a controller in a building includes a temperature sensor, a processing circuit, and a wireless radio. The processing circuit is configured to receive a measured temperature value from the temperature sensor, determine a current temperature error based on the current measured temperature value and a setpoint temperature, and determine whether a difference between the current temperature error and a previous temperature error is greater than an error threshold. The processing circuit is configured to determine whether a minimum amount of time has passed since transmitting a previous measured temperature value and transmit the current measured temperature value to the controller via the wireless transmitter in response to determining that both the difference between the current temperature error and the previous temperature error is greater than the error threshold and the minimum amount of time has passed since transmitting a temperature value.
    Type: Application
    Filed: June 9, 2017
    Publication date: December 13, 2018
    Applicant: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, Carlos Felipe Alcala Perez, Homero L. Noboa
  • Publication number: 20180299839
    Abstract: 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.
    Type: Application
    Filed: April 10, 2018
    Publication date: October 18, 2018
    Applicant: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, John M. House
  • Publication number: 20180284701
    Abstract: A control system is configured to operate a multiple-input system to achieve an optimal value for a performance variable of the multiple-input system. The control system includes a mapper configured to generate a mapping from a first number of manipulated variables to a second number of latent variables. The second number is smaller than the first number and each of the latent variables includes a linear combination of the manipulated variables. The control system also includes an extremum-seeking controller configured to receive the performance variable from the multiple-input system as a feedback and modulate values of the second number of latent variables to drive the performance variable to the optimal value. The mapper is further configured to use the mapping to translate modulated values of the second number of latent variables to modulated values of the first number of manipulated variables and provide the modulated values of the first number of manipulated variables to the multiple-input system.
    Type: Application
    Filed: March 31, 2017
    Publication date: October 4, 2018
    Applicant: Johnson Controls Technology Company
    Inventors: Timothy I. Salsbury, Carlos Felipe Alcala Perez, John M. House
  • Publication number: 20180267515
    Abstract: A control system is configured to operate a plant to achieve an optimal value for a performance variable of the plant. The system comprise a feedforward controller configured to receive a measurable disturbance to the plant and generate a feedforward contribution to a control input to the plant using the measurable disturbance. The system also comprises an extremum-seeking controller configured to receive the performance variable from the plant and generate an extremum-seeking contribution to the control input to drive the performance variable to the optimal value. The system further comprises a control input element configured to generate the control input by combining the extremum-seeking contribution and the feedforward contribution and provide the control input to the plant.
    Type: Application
    Filed: March 16, 2017
    Publication date: September 20, 2018
    Applicant: Johnson Controls Technology Company
    Inventors: John M. House, Timothy I. Salsbury