Excess air contamination level indicator

Details Excess air contamination level indicator Excess air contamination level indicator

1989-05-30

1990-06-19

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

356438, G01N 1500

Patent

active

049341839

ABSTRACT:
In an air contamination level detector for detecting the degree of contamination of the intake air to an internal combustion engine, a laser beam is directed through the intake air stream and light scattered from particles in the intake air stream are detected by a photodetector to generate a pulse for each particle. Pulses over a given size are used to enable an AND gate to pass high frequency pulses to a counter, which is periodically recycled. The count accumulated in the counter represents the duty cycle of the pulses and the dirtiness of the intake air. When the count in the counter reaches a preselected level, it causes a warning light to be energized to indicate that the intake air has a exceeded a tolerance level.

REFERENCES:
patent: 4302754 (1981-11-01), Magee et al.
patent: 4441513 (1984-04-01), Herwig
patent: 4491926 (1985-01-01), Okada et al.
patent: 4677426 (1987-06-01), Dattilo

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