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| Number | Title | Issue Date |
| 7740185 | Tempering method, control device and tempering device A method for controlling the temperature of a machine part, by the use of a regulating device, is accomplished by determining one respective value of a measured temperature at each of two separate spaced-apart measured points, which two points are located along a co... | 06/22/2010 |
| 7332996 | Connections for a cell site environmental control system A cell site environmental control system includes multiple relays, each monitoring a specific device whose status may have an impact on the environmental condition at the cell site. The cell site environmental control system includes a microprocessor-based central c... | 02/19/2008 |
| 7261242 | Sound insulation for electric relay An electric unit, such as a room thermostat has a circuit board and an electromechanical switch mounted to the circuit board. The circuit board and the electromechanical switch are housed in a casing. The casing is filled with a sound insulation material with the el... | 08/28/2007 |
| 7246753 | Slop predictive control and digital pid control for a variable temperature control system The present invention applies a slope predictive control method to a Variable Temperature Control (VTC) system, measuring the slope of the discharge temperature as a function of flow regulation device position, and using this slope to predict the position of the flo... | 07/24/2007 |
| 7219022 | Methods and apparatus for detecting failure of an isolation device Apparatus for detecting failure of an isolation device includes a current sensor to sense current through the isolation device and a circuit responsive to the current sensor output signal and to an enable signal that controls the isolation device for providing an Ea... | 05/15/2007 |
| 7191826 | Variable speed fan motor control for forced air heating/cooling system A fan motor speed control system for controlling the fan motor speed of an air conditioning system includes a power output circuit including a power triac which is turned on and off by an opto-isolator connected to a pulse generator circuit for varying an AC voltage... | 03/20/2007 |
| 7181295 | Method and apparatus for PID controller with adjustable deadtime compensation In the present invention, a Smith predictor enhanced PID controller, SP-PID, is proposed. A tuning parameter Ksp is devised and the SP-PID controller would be gradually transformed from a PID controller to a Smith predictor as Ksp changes from ... | 02/20/2007 |
| 7171820 | Non-linear control algorithm in vapor compression systems A PID control for a vapor compression system utilized to heat water identifies a particular range of error signals and derivative of the error signals that could be indicative of the cycle moving in an inefficient direction. If this determination is made, then a sub... | 02/06/2007 |
| 7159790 | Thermostat with offset drive A thermostat having a thermostat housing and a rotatable selector rotatably coupled to the thermostat housing via a support member. The rotatable selector is adapted to have a range of rotatable positions, wherein a desired parameter value is identified by the posit... | 01/09/2007 |
| 7159789 | Thermostat with mechanical user interface A thermostat having a thermostat housing and a rotatable selector disposed on the thermostat housing. The rotatable selector adapted to have a range of rotatable positions, where a desired parameter value is identified by the position of the rotatable selector along... | 01/09/2007 |
| 7150156 | Product simulating probe and method A probe and method for simulating refrigerated product temperature includes a housing containing a thermal mass having thermo-physical properties similar to refrigerated food product, a temperature sensing element operable to measure the temperature of the thermal m... | 12/19/2006 |
| 7069976 | Method and arrangement for controlling the temperature of the outstream flow from a heat exchanger and measuring produced heat Process and device for controlling the temperature of an outbound secondary flow in a secondary circuit from a heat exchanger by a primary flow in a primary circuit, via a member that regulates the primary flow, influenced by a control unit. The enthalpy difference ... | 07/04/2006 |
| 7063093 | Manual carwash nozzle structure A manual carwash nozzle structure includes a grip body, a barrel member, and a spray nozzle. The barrel member is formed of a connection body, an adjustment valve, and a detergent container. The connection body is provided with a water inlet in communication with a ... | 06/20/2006 |
| 7051946 | Air re-circulation index An index of air re-circulation in a data center having one or more racks is determined to identify the level of heated air re-circulation into cooling fluid delivered to the one or more racks. The one or more racks comprise inlets and outlets and are positioned alon... | 05/30/2006 |
| 7044213 | Constant temperature refrigeration system for extensive temperature range application and control method thereof A constant temperature refrigeration system for extensive temperature range application comprising a refrigerator, a low-temperature heat exchanger, a medium-temperature heat exchanger, a high-temperature heat exchanger, a pump, a first solenoid valve, a second sole... | 05/16/2006 |
| 7000412 | Constant temperature refrigeration system for extensive temperature range application and control method thereof A constant temperature refrigeration system for extensive temperature range application comprising a refrigerator, a low-temperature heat exchanger, a medium-temperature heat exchanger, a high-temperature heat exchanger, a pump, a first solenoid valve, a second sole... | 02/21/2006 |
| 7003379 | Limit cycle autotuning method and heat/cool control apparatus In a limit cycle autotuning method, the first limit cycle of alternately outputting a heat-side manipulated variable set point and a cool-side manipulated variable set point is generated. The first control response corresponding to the first limit cycle is detected.... | 02/21/2006 |
| 6995544 | Generator control apparatus An IC regulator for controlling an alternator by changing contents of control in dependence on ambient temperature includes a control voltage limiter (2), a field current controller (3), a temperature sensor (4), a first comparator (5) fo... | 02/07/2006 |
| 6993418 | Method and apparatus for latent temperature control for a device under test A method and associated algorithm for controlling and optimizing the temperature of a device under test (DUT) through calculation of a moving setpoint which varies from the user-specified DUT core temperature. The method generally comprises (i) calculating a system ... | 01/31/2006 |
| 6986469 | Method and apparatus for energy recovery in an environmental control system Control apparatus for an environmental control system comprises input circuitry receiving environmental information and output circuitry for controlling an HVAC system. Processing circuitry in the controller configures the output circuitry based at least in part on ... | 01/17/2006 |
| 6951998 | Controller, temperature regulator and heat treatment apparatus A plurality of individually corresponding heaters and temperature sensors are provided along with a plurality of a PID control means. An average temperature/gradient temperature calculating means calculates the average temperatures of the temperatures measured by th... | 10/04/2005 |
| 6924758 | Thermostat with resistor-to-digital-converter control of trip point The present invention controls a thermostat trip point using a resistor-to-digital converter. Generally, the value of an external resistor is measured and converted to a digital code equivalent. The digital code drives a DAC (Digital-to-Analog Converter) which sets ... | 08/02/2005 |
| 6910341 | Temperature control apparatus and method of operating the same A temperature control unit and a method of operating a temperature control unit. The temperature control unit including a refrigeration circuit enclosing a refrigerant and having a compressor, a condenser, and an evaporator coil. The method including providing a fir... | 06/28/2005 |
| 6892474 | Method for controlling air conditioner In drying the interior of an indoor unit, room humidity (Rh) is detected by a humidity sensor, and a drying operation cycle, in which after first heating operation, which is weak heating operation in which a compressor included in a refrigerating cycle is operated a... | 05/17/2005 |
| 6866202 | Variable output heating and cooling control A heating or cooling system, such as an HVAC system, of variable output has a number of control elements and may include a variable speed compressor, a variable speed combustion (induced or forced draft) blower motor; a variable speed circulator blower motor; a vari... | 03/15/2005 |
| 6783080 | Systems and methods for controlling temperatures of process tools A system and method for controlling a critical process variable, such as the temperature of one or more temperature control units for cluster tools in a semiconductor fabrication facility, uses dual interrelated PID) algorithms for interrelated but at times separate... | 08/31/2004 |
| 6766962 | Temperature maintaining apparatus and temperature control apparatus and method therefor A method and apparatus are provided for maintaining a temperature between a first value and a second value. The method and apparatus utilize a heat transfer device capable of cycling through a series of cycles, the device being capable of changing the temperature fr... | 07/27/2004 |
| 6738676 | Controller having PID selection function A controller (1) has a fuzzy calculation means (64) for performing a fuzzy calculation in order to calculate a PID value (P, I, D) based on a switch time T, a PID value (P1, I1, D1) before switching of the PID value, an... | 05/18/2004 |
| 6732938 | Quasi-steady-state control method for a vehicle automatic climate control A motor vehicle automatic climate control determines HVAC parameter values for satisfying the required heating or cooling effort for steady-state cabin air temperature regulation, and controls the HVAC settings based such parameter values and on the deviation of the... | 05/11/2004 |
| 6715690 | Slope predictive control and digital PID control The present invention provides an airflow control loop that uses averaged airflow measurements without the problems that are normally encountered with averaging measurements, such as the delay introduced into the airflow control loop. This is accomplished, in the pr... | 04/06/2004 |
| 6705533 | Digital modulation for a gas-fired heater A method is disclosed for operating a gas-fired heater to maintain temperature within a zone. The gas-fired heater is modulated between a higher firing rate and a lower firing rate within a pseudo steady-state mode until a current firing rate exceeds a predetermined... | 03/16/2004 |
| 6695046 | Variable speed fan motor control for forced air heating/cooling system A fan motor speed control system for controlling the fan motor speed of an air conditioning system includes a power output circuit including a power triac which is turned on and off by an opto-isolator connected to a pulse generator circuit for varying an... | 02/24/2004 |
| 6688532 | Controller, temperature controller and heat processor using same A controller controls a physical variable such as temperature of a controlled system. A variable calculator calculates and output a manipulated variable on the controlled system based on of a target value such as a target temperature and a feedback value ... | 02/10/2004 |
| 6684944 | Variable speed fan motor control for forced air heating/cooling system A forced air heating and/or cooling system utilizing an induction type fan motor is controlled by a controller circuit which is operable to continuously vary the speed of the fan motor during a start-up phase and a shut-down phase of the heating and/or co... | 02/03/2004 |
| 6669101 | Vehicle air conditioner with automatic air-conditioning control having learning function of manual operation In a vehicle air conditioner with an automatic control having a learning function of manual operation, when a passenger manually sets an air blowing amount in the automatic control, it is determined whether or not an air blowing amount after the manual op... | 12/30/2003 |
| 6670585 | Humidity cabinet with automatic fluid fill system A fluid fill system includes at least one sensor for indicating whether a fluid level in a reservoir is equal to or greater than a predetermined fluid level and a process control. The process control obtains a reading from the at least one sensor at a pre... | 12/30/2003 |
| 6662583 | Adaptive control for a cooling system A method and controller for a refrigerant pressure effecting component of a cooling system includes providing closed loop control over a pressure effecting component based on an error signal, performing a control algorithm that includes at least one progr... | 12/16/2003 |
| 6659361 | Temperature control device The controller 70 of the brine supply device 10 performs the PID calculation of the manipulated variable MV of the valve 14, calculates the compensated manipulated variable MV' by compensating the manipulated value MV, and controls the operation of the va... | 12/09/2003 |
| 6622926 | Thermostat with air conditioning load management feature A thermostat comprising a software sub-routine for controlling the operation of an air conditioner and a stored value representative of the air conditioner's operating and non-operating time, which is indicative of the outdoor temperature and load on the ... | 09/23/2003 |
| 6612502 | Integrated circuit chip for use as an electronic thermostat An integrated circuit chip, useful as an electronic thermostat, comprises a temperature sensor for providing a signal corresponding to ambient temperature. A digital counter contains a value which, after digital-to-analog conversion by a DAC, corresponds ... | 09/02/2003 |
