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
Quinoid thiophene organic photoelectric material, preparation method thereof and application thereof
Systems and methods for managing fleet services
Pyrrolidine-1,2-dicarboxamide derivatives
Device for identifying types of document files
Semiconductor device and method of manufacturing the same
Device and method including a soldering process
Methods of packaging imager devices and optics modules, and resulting assemblies
  Randomly Featured Patents
Sump pump
Column analog-to-digital conversion apparatus and method supporting a high frame rate in a sub-sampling mode
Solid state processing of hand-held knife blades to improve blade performance
Focusing electrode for field emission displays and method
Attachable debris filter for BWR nuclear fuel assemblies
Hybrid wireless network for data collection and distribution
Male urinal
High dynamic performance DC-DC converter system with time share control
Method of increasing the ductility of articles formed from superplastic alloy and article
Input device for graphics