Diagnostic system for combustion controller

• US 4,885,573 A
• Filed: 08/12/1987
• Issued: 12/05/1989
• Est. Priority Date: 08/12/1987
• Status: Expired due to Term

• Current Assignee: Gas Technology Institute
• Original Assignee: Gas Research Institute (GTI Energy)
• Inventors: Hall, George II, Smith, Robert A., Fry, John J.
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US07/084,689
• Time in Patent Office: 846 Days
• Field of Search: 340/519, 340/500, 340/501, 340/506, 340/511, 340/520, 340/521, 340/525, 340/537, 340/588, 340/870.04, 340/870.16, 431/13, 431/18, 374/144
• US Class Current: 340/519
• CPC Class Codes: F23N 1/02 conjointly with air supply
• CPC Class Codes: F23N 2223/04 Memory
• CPC Class Codes: F23N 2223/08 Microprocessor; Microcomputer
• CPC Class Codes: F23N 2223/38 Remote control
• CPC Class Codes: F23N 2231/20 Warning devices
• CPC Class Codes: F23N 5/003 using detectors sensitive to combustion gas properties F23N5/02, F23N5/18 - F23N5/26 take precedence
• CPC Class Codes: F23N 5/006 the detector being sensitive to oxygen
• CPC Class Codes: F23N 5/242 using electronic means
• CPC Class Codes: F23N 5/26 Details
• CPC Class Codes: G05B 2219/24063 Select signals as function of priority, importance for diagnostic
• CPC Class Codes: G05B 2219/24103 Graphical display of proces as function of detected alarm signals
• CPC Class Codes: H05K 7/1484 Electrical diagrams relating to constructional features, e.g. signal routing within PLC; Provisions for disaster recovery, e.g. redundant systems

Abstract

A combustion control system includes a sensor assembly and a process controller, the sensor assembly including sensors for providing output signals indicative of process variables, the process controller responding to the output signals to maintain a desired operation of the process. The process controller continuously monitors parameters of the sensors and provides alarms whenever any of these parameters deviate from setpoint values, the process controller automatically prioritizing these alarms to provide a display of only the most relevant alarms. A housing enclosing the processor controller provides RFI/EMI shielding of the process controller including the attenuation and absorption of the EMI/RFI energy.

Claims

1. In a combustion control system including a sensor assembly having sensor means for providing an output signal indicative of at least one parameter of the process, a process controller means comprising:

input means for receiving the output signals provided by the sensor means, processing means for processing the signals and generating control outputs to maintain a desired operation of the process, said signal processing means including monitoring means for continuously monitoring parameters of the combustion control system including parameters of the sensor means and generating an alarm signal whenever any one of the parameters deviates from a setpoint value, display means controlled by said signal processing means for displaying alarm conditions, and said signal processing means including prioritization means for automatically prioritizing the alarms to provide a display of select alarm conditions based on detailed knowledge of internal operations of an analyzer system which is a direct result of a construction of said analyzer system, and the combustion control system and said prioritization means disregard suspect sensor readings through a program contained in a memory of the combustion control system.

2. A combustion control system according to claim 1, wherein a first group of the monitored parameters are predefined in terms of correct operation of the sensor assembly, and a second group of said parameters are selectable as a function of operating modes for the combustion control system, and further comprising user interface means coupled to said signal processing means to enable the user to apply to said signal processing means selected setpoint values for said second group of parameters.

3. A combustion control system according to claim 2, wherein said prioritization means causes a display of an alarm condition for deviation of any one of the parameters of said first group from respective setpoint values and suppresses display of an alarm condition for any one of the parameters of said second group in the presence of an alarm condition for any one of the parameters of said first group.

4. A combustion control system according to claim 3, wherein said prioritization means controls said user interface means to display certain ones of said alarm conditions on said display means and generates alarm signals corresponding to other ones of said alarm conditions for application to a control system interface to effect adjustment in system operation in accordance with the alarms being generated.

5. A combustion control system according to claim 3, said sensor means includes a plurality of sensors and wherein said prioritizations means responds to an alarm signal indicative of a failure condition for a given one of said sensors to suppress the display of an alarm condition indicative of deviation from the setpoint value of the parameter monitored by said one sensor and to apply said alarm signal to a control system interface to effect transfer of system operation to a known safe condition.

6. A combustion control system including a sensor assembly having at least first and second parameter sensor means each providing output signals indicative of different parameters of the process, a process controller means comprising:

input means for receiving the output signals provided by the first and second parameter sensor means, signal processing means for processing the signals and generating control outputs to maintain a desired operation of the process, said signal processing means including monitoring means including component sensing means for continuously monitoring operating conditions of the first and second sensor means and generating an alarm signal whenever a process parameter or a sensor operating condition deviates from a setpoint value, and user interface means coupled to said signal processing means and including display means controlled by said signal processing means for displaying the alarm conditions, and said signal processing means including prioritization means for automatically prioritizing the alarm conditions to provide a display of select alarm conditions based on detailed knowledge of internal operations of an analyzer system which is a direct result of a construction of said analyzer system, and the combustion control system and said prioritization means disregard suspect sensor readings through a program contained in a memory of the combustion control system.

7. A combustion control system according to claim 6, wherein said user interface means includes a keyboard, and wherein the system parameters are predefined, and wherein process alarms and trim alarms which are a function of the process being controlled have their limits user adjustable via said keyboard based on the user'"'"'s knowledge of the process.

8. A combustion control system according to claim 7, wherein said prioritization means causes a display of an alarm condition for deviation of any one of said system parameters from its respective setpoint value and suppresses display of an alarm condition for any one of said sensor operating conditions in the presence of an alarm condition for any one of said system parameters.

9. A combustion control system according to claim 7, wherein said prioritization means causes display of an indication of an alarm condition for process parameters whenever they occur and said prioritization means causes display of an indication of an alarm condition for a sensor operation condition only in the absence of an alarm condition for a process parameter.

10. In a combustion control system including a sensor assembly having sensor means for providing an output signal indicative of at least one parameter of the process, a process controller means comprising:

input means for receiving the output signals provided by the sensor means, processing means for processing the signals and generating control outputs to maintain a desired operation of the process, said signal processing means including monitoring means for continuously monitoring parameters of the combustion control system including parameters of the sensor means and generating an alarm signal whenever any one of the parameters deviates from a setpoint value, display means controlled by said signal processing means for displaying alarm conditions, and signal processing means including prioritization means for automatically prioritizing the alarms to provide a display of only relevant alarm conditions;

a first group of the monitored parameters predefined in terms of correct operation of the sensor assembly, a second group of said parameters selectable as a function of operating modes for the combustion control system, user interface means coupled to said signal processing means to enable the user to apply to said signal processing means selected setpoint values for said second group of parameters;

said prioritization means causing a display of an alarm condition for deviation of any one of said parameters of said first group from respective setpoint values and suppressing display of an alarm condition for any one of the parameters of said second group in the presence of an alarm condition for any one of the parameters of said first group; and

certain ones of the parameters of said first group being internal system variables and said prioritization means causing display of an alarm condition whenever the certain parameters deviate from setpoint values;

a further parameter of said first group being indicative of application of power to at least said sensor assembly, said prioritization means causing display of an alarm condition whenever power is not applied to said sensor assembly and wherein the parameters of the second group are indicative of conditions of the sensor, said prioritization means causing display of their alarm conditions only in the absence of alarm conditions for all parameters of said first group.

11. In a control system including a sensor assembly having sensor means for providing an output signal indicative of at least one parameter of the process, a process controller means comprising:

input means for receiving the output signals provided by the sensor means, signal processing means for processing the signals and generating control outputs to maintain a desired operation of the process, said signal processing means including monitoring means for continuously monitoring parameters of the combustion control system including parameters of the sensor means and generating an alarm signal whenever any one of the parameters deviates from a setpoint value, display means controlled by said signal processing means for displaying the alarm conditions, and said signal processing means including prioritization means for automatically prioritizing the alarm conditions to provide a display of only relevant alarm conditions; and

a first group of the monitored parameters predefined in terms of correct operation of the sensor assembly, and a second group of said parameters selectable as a function of operating modes for the control system, and further comprising user interface means coupled to said signal processing means to enable the user to select setpoint values for said second group of parameters, said prioritization means causing a display of an alarm condition for deviation of any one of the parameters of said first group from respective setpoint values and suppressing display of an alarm condition for any one of the parameters of said second group in the presence of an alarm condition for any one of the parameters of said first group.