Integrated control system using a microprocessor

• US 4,421,268 A
• Filed: 10/17/1980
• Issued: 12/20/1983
• Est. Priority Date: 10/17/1980
• Status: Expired due to Term

• Current Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: Bassett, William W., Rask, Dean R.
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US06/197,842
• Time in Patent Office: 1,159 Days
• Field of Search: 236/91 F, 236/9, 236/10, 236/91 G, 236/21 R, 236/91 A, 431/16, 431/20, 431/78
• US Class Current: 236/10
• CPC Class Codes: F23N 1/062 using electronic means
• CPC Class Codes: F23N 2231/26 for clogging air inlet
• CPC Class Codes: F23N 5/022 using electronic means F23N5/04 - F23N5/14 take precedence
• CPC Class Codes: F23N 5/184 using electronic means
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/61 using timers
• CPC Class Codes: F24F 11/64 using pre-stored data
• CPC Class Codes: F24F 11/86 by controlling compressors within refrigeration or heat pump circuits
• CPC Class Codes: F24F 11/88 Electrical aspects, e.g. circuits
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 2140/00 Control inputs relating to system states
• CPC Class Codes: F24F 2221/54 Heating and cooling, simultaneously or alternatively
• CPC Class Codes: G05D 23/1917 using digital means

Abstract

An integrated control system for a temperature conditioning apparatus which contains a microprocessor which is connected to the various components of a control system of the temperature conditioning apparatus such as the space thermostat, the fuel valve, the fuel igniter and ignition proving apparatus, the stack temperature sensor, the ambient or vestibule temperature sensor, the plenum temperature sensor, the induced draft blower motor, the refrigeration compressor, and the air circulating fan or blower. With the microprocessor, which has the capability of fast and many types of operations, the interaction of parameters of the temperature conditioning apparatus and operation of the various components of the system can be controlled in an improved manner to add to the overall efficiency of such a temperature conditioning apparatus.

Claims

1. An improvement in a temperature control system for use with a temperature conditioning apparatus having a power blower delivering exhaust gases from a combustion chamber to an exhaust stack, the improvement comprising

temperature responsive means responsive to the output exhaust gas temperature of the temperature conditioned apparatus,

first means connected to said temperature responsive means to respond to a decrease in said exhaust gas temperature from a predetermined temperature,

ambient temperature responsive means adapted to respond to the ambient temperature of the temperature conditioning apparatus, and

second means connecting said ambient temperature responsive means to said first means whereby said first means responds to a predetermined difference between the temperature of the exhaust gas and ambient temperature.

2. In a temperature control system for a temperature changing apparatus deivering temperature conditioned air to a space, the apparatus being connected to an exhaust gas stack, comprising

space temperature responsive means adapted to respond to the temperature in the space,

control means adapted to control the temperature conditioning apparatus,

first means connecting said space temperature responsive means to said control means to maintain a predetermined temperature in the space,

exhaust gas temperature responsive means adapted to respond to the output exhaust gas temperature of the exhaust gas,

means connecting said control means to said exhaust gas temperature responsive means,

ambient temperature responsive means adapted to respond to the ambient temperature of the temperature conditioning apparatus, and

second means connecting said ambient temperature responsive means to said control means to be responsive to an output of said ambient temperature responsive means whereby said control means is effected by an abnormal operation of the temperature conditioning apparatus.

3. The invention of claim 2 wherein the temperature conditioning apparatus is a furnace.

4. The invention of claim 2 wherein

the differential temperature between said exhaust gas temperature responsive means and said ambient temperature responsive means and said ambient temperature responsive means is compared with a preprogrammed differential temperature stored in said control means and said control means is adapted to modify the operation of the temperature conditioning apparatus when said differential temperature deviates from said stored differential temperature by a predetermined amount.

5. The invention of claim 4 wherein said control means is a microprocessor.

6. An improvement in a temperature control system for use with a temperature conditioning apparatus having a power blower delivering exhaust gases from a combustion chamber to an exhaust stack, the improvement comprising

temperature responsive means responsive to the output exhaust gas temperature of the temperature conditioned apparatus,

first means connected to said temperature responsive means to respond to a decrease in said exhaust gas temperature from a predetermined temperature,

vestibule temperature responsive means adapted to respond to the vestibule temperature of the temperature conditioning apparatus, and

second means connecting said vestibule temperature responsive means to said first means whereby said first means responds to a predetermined difference between the temperature of the exhaust gas and vestibule temperature.

7. The invention of claim 6 wherein

the differential temperature between said exhaust gas temperature responsive means and said vestibule temperature responsive means is compared with a preprogrammed differential temperature value stored in said control means whereby said control means is adapted to change the operation of the temperature conditioning apparatus.

8. The invention of claim 7 wherein said control means comprises a microprocessor.

9. In a temperature control system for a temperature changing apparatus delivering temperature conditioned air to a space, the apparatus being connected to an exhaust gas stack, comprising

space temperature responsive means adapted to respond to the temperature in the space,

control means adapted to control the temperature conditioning apparatus,

first means connecting said space temperature responsive means to said control means to maintain a predetermined temperature in the space,

exhaust gas temperature responsive means adapted to respond to the output exhaust gas temperature of the exhaust gas,

means connecting said control means to said exhaust gas temperature responsive means,

vestibule temperature responsive means adapted to respond to the vestibule temperature of the temperature conditioning apparatus, and

second means connecting said vestibule temperature responsive means to said control means.