Condition control system for efficient transfer of energy to and from a working fluid
AssigneeHoneywell Inc.
InventorJeffrey M. Hammer
Life of this patent
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Abstract
A condition control system adapted to supply a working fluid that has been modified by transferring energy to or from the working fluid is disclosed wherein a minimum energy loss is accomplished in operating the control system. The control system adjusts the setpoint of the system in response to parameters measured around the system and further provides for a minimum on/off cycling of the system in the event that the system is applied to a device which alters the working fluid between a fixed lower rate and an upper rate as would be typical in a burner-boiler configuration.
Claims20
A condition control system adapted to control a system for modifying a working fluid by controlling the transfer of energy to and from said working fluid at varying rates including a fixed lower on rate, a fixed upper rate, and a modulating rate between said two fixed rates, including:
- condition sensor means including output means responsive to the condition of said working fluid;
- setpoint means having at least two operating modes and including adjustable input means to set a level of operation for said system;
- said setpoint means including system responsive input means, and having output means which is dependent upon said adjustable input means and said system responsive input means to determine which of said operating modes is provided to control said setpoint output means;
- said setpoint output means being combined with said condition sensor output means to provide a preliminary error signal;
- off-on error detection means connected to receive said preliminary error signal and having output means providing an off-on output control signal;
- condition control sequencer means connected to control said system between an off state and said fixed upper rate to modify said working fluid with said on-off error detection output means controlling said sequencer means between said off state and said lower on rate;
- error signal processing means connected to said preliminary error signal and having error signal output means and further having integrated output signal means;
- combining means connected to said error signal output means and to said integrated output signal means to provide a sequencer command output signal capable of operating said sequencer means from said lower on state to said fixed upper rate;
- said integrated output signal means further connected to said setpoint means to affect a first of said operating modes of said setpoint means;
- responsive means having input means connected to said condition sensor output means and having further input means responsive to said on-off error detector means;
- said load responsive means having switched output means that acts as a limit for said system;
- said switched output means connected to said setpoint system responsive input means to select one of said operating modes;
- gate means controlled by said switched output means to in turn control the connection of said sequencer command output signal means to said sequencer means;
- and cycle timer means having an input responsive to said sequencer means wherein said off-on error detection means provides the operating time of said system, and an output connected to said setpoint means to determine an operating level of said setpoint means to affect a second of said modes of said setpoint means operation.
Dependencies are inferred from the claim text.