Marine speedometer

Details Marine speedometer Marine speedometer

1994-08-19

1996-08-06

Cosimano, Edward R.

Boots, shoes, and leggings

73181, 73182, 324160, 36457101, G01P 5165, G01P 2100, G01C 2100

Patent

active

055440762

ABSTRACT:
A marine speedometer system is disclosed which utilizes a short pitot tube or air column. The speedometer system includes an inlet having a short air column, a transducer, a control circuit, and a display. The electric signal from the transducer is representative of the pressure in the short air column. The control circuit preferably utilizes a microprocessor and a look-up table to generate a display signal in response to an electric signal from the transducer. The look-up table includes T-Buoy values and count values. The count values are used to drive a frequency signal for an air core meter. The display provides a needle and a metered background which is easy to read. The microprocessor is coupled to receive calibrate up and calibrate down signals. The microprocessor causes the needle to jump when it receives a signal to provide feedback to the driver. The microprocessor includes an auto zero subroutine which automatically calibrates the speedometer at start up.

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