US 8,485,137 B2Granted

Combustion control device

AssigneesNoritz Corporation, Noritz Electronics Technology Corporation Inc.

InventorsTomoki Kishimoto, Yuji Takagi, Masayoshi Yasukawa, Akira Takabayashi, Shinichi Okamoto, Hiroshi Yakoyama, Takashi Yashima, Masanori Kubotani

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Abstract

The present invention relates to a combustion control device incorporated in an apparatus such as water heater and provides the combustion control device having an improved configuration with a main controller and a sub controller, capable of employing a microcomputer with lower capability as the sub controller, and ensuring higher safety than ever before. Signals indicating a combustion state of a combustion apparatus are inputted into the main controller 35 and the sub controller 36 in parallel. Upon fulfillment of a predetermined condition of stopping, the main and sub controllers 35 and 36 each output a stop signal to cut off a current to be supplied to a device driving circuit 42. The conditions of stopping in outputting of the stop signal by the main and sub controllers are such that the sub controller 36 is less apt to execute the cutoff than the main controller 35.

Claims19

Dependent claims

A combustion control device comprising:

a power cutoff circuit electrically connected to a first output terminal line and a second output terminal line, either a first stop signal or a second stop signal controlling said power cutoff circuit to inhibit a supply of fuel to an element;
a monitoring circuit configured to detect a first criterion of a system component and to detect a second criterion of the system component, a monitoring signal being output from said monitoring circuit;
a sub controller configured to output said first stop signal onto said first output terminal line only when a first input signal indicates an existence of the first criterion, said first input signal being said monitoring signal that has been received by said sub controller;
a main controller configured to output said second stop signal onto said second output terminal line when a second input signal indicates the existence of the second criterion, said second input signal being said monitoring signal that has been received by said main controller,
wherein said main controller is configured to detect a difference between said second input signal and said first input signal.

2 more elements

Dependencies are inferred from the claim text.