Patent
Field-mounted control unit
Jogesh Warrior,Vincent C. Jacobson,Kelly M. Orth,Craig R Tielens +3 more
- 01 Oct 1990
112
TL;DR: In this paper, a smart field-mounted control unit, for controlling a process, receives signals and sends a command output over a two-wire circuit which powers the control unit.
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Abstract: A smart field-mounted control unit, for controlling a process, receives signals and sends a command output over a two-wire circuit which powers the control unit. An input section receives the signals, which can be instructions representative of commands or instruction sets, process variables sensed by external control units or setpoints representative of a desired process state. The instructions are representative of a control requirement of the process and adjust a controlling section in the control unit to generate the command output in conformance with the control requirement. The command output can be a function of the difference between the process setpoint and a process variable, or a function of a linear combination of a process variable and its calculated time integral and time derivative functions. A sensing section in the control unit can sense and scale a process variable for generating the command output as well. The control unit can include a regulator section, controlled by the command output, which regulates application of a mechanical, hydraulic, pneumatic or electromagnetic force applied to the process.
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Citations
Patent
Process control system using standard protocol control-of standard devices and non-standard devices
Mark Nixon,Robert B. Havekost,Larry O. Jundt,Dennis L Stevenson,Michael G. Ott,Arthur Webb,Michael J Lucas +6 more
- 12 Apr 1996
TL;DR: In this article, a process controller implements and executes a standard set of function blocks or control functions defined by a standard protocol so that standard-type control is achieved with respect to non-standard-type devices.
296
Patent
Integrated communication network for use in a field device management system
Richard R. Sharpe,Craig R. Tielens,Jon Westbrock +2 more
- 04 Dec 1996
TL;DR: In this article, a field device management system includes an interface which provides communication between a software application implemented on the system and a set of smart field devices coupled to the system, and the interface accesses information from and/or writes information to the smart field device, a database and device descriptions associated with the smart device to provide a consistent communication connection with such devices, database and description.
237
Patent
Refrigeration system and method of operating the same
Norman E. Street,Ted W. Sunderland +1 more
- 12 Jun 2003
TL;DR: In this article, a system controller is used to control a subsystem having one of the compressor, condenser, valve, refrigeration branch, and case of a case adapted to be cooled by the evaporator coil, and a subsystem controller in communication with the system controller.
233
Patent
Distributed intelligence control for commercial refrigeration
Norman E. Street,Ted W. Sunderland,Charles D. Thomas,Doron Shapiro,Michael J. D'anna +4 more
- 14 Mar 2001
TL;DR: In this article, a commercial refrigeration system has a control system (70) which distributes intelligence to increase granularity of the control and simplify wiring, assembly and installation of compressors.
203
Patent
Fluid flow control system, fluid delivery and control system for a fluid delivery line, and method for controlling pressure oscillations within fluid of a fluid delivery line
Jeffrey C. Tucker,Brian L. Andersen,Robert Mittelstadt +2 more
- 28 Feb 2001
TL;DR: A fluid delivery and control system for a fluid delivery line having elastic components is described in this paper. But the system is not suitable for the use of computer program code logic (CCL).
170
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