초록 ▼

A microcomputer-based spark ignition gas burner control system includes program logic to ensure compatibility of spark ignition and a microcomputer. The program logic provides for periodically re-defining the I/O (input/output) ports so as to negate the adverse effect of any electrical noise generat

A microcomputer-based spark ignition gas burner control system includes program logic to ensure compatibility of spark ignition and a microcomputer. The program logic provides for periodically re-defining the I/O (input/output) ports so as to negate the adverse effect of any electrical noise generated in the system. The program logic also provides, during ignition, a cyclically re-occurring finite time period during which sparking occurs followed by a finite time period during which flame detect circuit means is enabled. The system further includes a fault-tolerant spark generating circuit to ensure that sparking is inhibited during times that the combustion chamber is being purged of any combustible mixture.

대표청구항 ▼

In a gas burner control system, a burner; electrically operated valve means connected fluidically in series with said burner; first circuit means for controlling energizing of said valve means; second circuit means for producing sparks at said burner; third circuit means for detecting flame at said

In a gas burner control system, a burner; electrically operated valve means connected fluidically in series with said burner; first circuit means for controlling energizing of said valve means; second circuit means for producing sparks at said burner; third circuit means for detecting flame at said burner; and a microcomputer connected through input/output pins to said first, second, and third circuit means for controlling operation thereof, said microcomputer including a central processing unit for defining a desired status, input or output, of said pins, by writing data to said pins, each of said pins having associated therewith a data direction register which, in response to said defining by said central processing unit, establishes said desired status, said microcomputer including program means for negating the effect of a change in said established status when said change is caused by means other than a change in said defining by said central processing unit, said program means comprising a program sub-routine for causing said central processing unit to periodically re-define the status of said each of said pins to said desired status.