4016results about "Controllers with particular characteristics" patented technology

A controller with configurable connections between data processing components that is optimized to provide a particular function such as temperature control is provided. In one embodiment, the controller includes a number of configurable inputs and outputs that may be used with digital and / or analog signals. The controller includes a data processor with a plurality of data processing components including a first and a second loop control function. The inputs and outputs which are configurable to the loop control functions are defined as a set of allowed inputs and outputs for each of the loop control functions. The set of allowed inputs and outputs for the first loop control function is a subset of the set of allowed inputs and outputs for the second loop control function.

Systems and methods for registering a web to an on-line pitched unit operation.

A new feedback linearization approach to advanced control of single-unit and multi-unit HVAC systems is described. In accordance with the approach of the invention, this new nonlinear control includes a model-based feedback linearization part to compensate for the nonlinearity in the system dynamics. Therefore, the evaporating temperature and superheat values can be controlled by linear PI control designs to achieve desired system performance and reliability. The main advantages of the new nonlinear control approach include (1) better performance even with large model errors, (2) being able to adapt to indoor unit turn on / off operation, (3) much smaller PI control gains compared to that of current feedback PI controls, (4) much easier design procedures since there is no need for tuning the PI control gains over wide range operation.

A system and method for controlling a fan is disclosed. In one embodiment, a fan controller is integrated in silicon and uses an embedded microcontroller to implement a digital fan control algorithm. The microcontroller may continually monitor temperature and sample the speed of the controlled fan. The speed of the fan may be compared to RPM values fitted on a desired curve that is representative of the Temperature-versus-RPM function for the given controlled fan. The fan control algorithm may be based on a PID compensator or a Ramp Rate Closed-loop controller (RRCC), which may be operated to drive the fan to the desired speed. The fan may also provide a Fan ID feedback signal to the microcontroller, which may use the Fan ID feedback signal upon system start-up to initialize the PID compensator gain settings or the RRCC parameter settings, and select the appropriate Temperature-versus-RPM function curve based on pre-determined values for the given fan. Thus, fans from different vendors may be changed at the factory without having to perform configuration programming. The need for a PWM command may be obviated, thereby facilitating the removal of any associated circuitry from the given fan, and thus reducing the cost of the fan.

A door operator for controlling operation of a door, the door operator having a motor to open the door against a spring force, the door operator further comprising a door position sensor for transmitting a signal indicative of door position; and among other things, calculates a door moment of inertia based on a net torque and the time for the door to reach a predetermined angle from the closed position. Also provided is a door operator that compares door speed to a desired door speed based on a door speed-position profile and generates a door speed error signal and minimizes the door speed error signal by adjusting the braking load resulting from charging a chargeable battery using the motor as a generator.