Resources Contact Us Home
Timer circuit arrangement in digital combustion control system

Image Number 2 for United States Patent #4299556.

A timer circuit arrangement for use with a digital combustion control system functions to check failure of a safety timer which stops the combustion operation in the event that ignition is not completed within a predetermined time. The arrangement has a simple circuit which checks the safety timer in advance of initiation thereof. A pre-purge timer, which determines a predetermined time for feeding only combustion air into the combustion chamber for purge thereof in advance of the combustion, and the safety timer are built with a unitary construction. A series connection of flip-flop circuits is provided for carrying out frequency division of clock pulses to obtain predetermined times, and the flip-flop circuits for the safety timer are constituted by at least a part of the flip-flop circuits for the pre-purge timer so that the pre-purge may continue infinitely when the safety timer become out of order, thereby preventing the operation for combustion and ensuring safety of operation.

  Recently Added Patents
LED lamp including heat dissipator
Scalable architecture for rank order filtering
Image-processing method and program, and image-processing apparatus
Monolithic widely-tunable coherent receiver
Mesa-shaped piezoelectric resonator element
Dynamic facsimile transcoding in a unified messaging platform
Requirements model comparative analysis method for effort estimation in customizing a network monitoring and control system
  Randomly Featured Patents
Method for forming thermal barrier coating on hot-gas-path components of gas turbine during operation
Sputtering target for producing metallic glass membrane and manufacturing method thereof
Solid dielectric capacitor and method of manufacture
Two component biocidal process
Software assisted multicast filtering
Electrical circuit breaker having a bimetal plate member of rectangular configuration
Network switch memory interface configuration
System for controlling use of a solid-state storage subsystem
Apparatus and method for washing substrate