Toyota Jidosha Kabushiki Kaisha

Syuzi Iida

Kazunari Hosome

Toshiji Tachibana

Kazuya Tomathu

Katsutoshi Kimura

Combustion facilities includes a combustion apparatus having a burner, a fuel control valve disposed along a fuel feeding pipe, a air control valve disposed along an air feeding pipe. An optical sensor detects radiated light originating in combustion flame of the burner, and converts it into a first electric signal. The first electric signal is a composite signal consisting essentially of an intensity signal element reflective of the intensity of the detected light and an oscillation signal element reflective of fluctuation of the turbulent combustion flame caused by the air feeding to the burner. A sensor amplifier, which is connected to the optical sensor, extracts both the oscillation signal element and an intensity factor representative of a real intensity of the radiated light originated in only the combustion flame, from the first electric signal, and generates a second electric signal by dividing the oscillation signal element by the intensity factor. A combustion controller, which is connected to the sensor amplifier, applies frequency analysis to the second signal, and calculates 'Oscillation Power' based on the result of the frequency analysis. The oscillation power is closely related to the excess air ratio to be controlled. The combustion controller controls the air control valve based on the oscillation power, separated from the fuel control valve.

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Aichi, Japan

Syuzi Iida