Apparatus for detecting grade of vehicle from atmospheric pressu

Details Apparatus for detecting grade of vehicle from atmospheric pressu Apparatus for detecting grade of vehicle from atmospheric pressu

1980-12-01

1982-11-02

Woodiel, Donald O.

Measuring and testing

Navigation

Take-off and landing monitors

33366, 73146, G01C 2100

Patent

active

043567266

ABSTRACT:
Two hermetically sealed chambers alternately hold the atmospheric pressure in response to a timing pulse generated each time a vehicle travels a predetermined distance. The difference between the atmospheric pressures held in the sealed chambers is detected by a semiconductor pressure sensor disposed between the sealed chambers. Two sample and hold circuits alternately sample and holds the detection output of the semiconductor pressure sensor in response to the timing pulse. A comparison circuit compares the hold outputs of the sample and hold circuits to generate an output corresponding to the difference or the grade of the vehicle. If necessary, the output of the comparison circuit is converted to a pulse signal having a pulse time width corresponding to the output.

REFERENCES:
patent: 3378932 (1968-04-01), Neill
patent: 4302973 (1981-12-01), Yoshino et al.

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