Apparatus and process for automatically calibrating locomotive s

Details Apparatus and process for automatically calibrating locomotive s Apparatus and process for automatically calibrating locomotive s

1989-12-11

1990-08-07

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01P 2102

Patent

active

049457535

ABSTRACT:
A speedometer system for automatically calibrating a speedometer by adjusting the speedometer drive to take into account the varying wheel sizes of a locomotive which comprises: at least one speed probe; a speedometer drive; a speedometer; a gate for enabling and disabling the normal speed signal from the speed probe; a programmable counter for transmitting a test speed signal to the speedometer drive to produce a test speed current; a gate for enabling and disabling the transmission of the test speed signal to the speedometer drive; and a microprocessor which is capable of processing a signal representative of wheel size, calculating a test signal frequency, causing the counter to create and transmit the test signal, measuring the speedometer current, and signaling a digital potentiometer to increase or decrease the resistance on the speedometer drive until a full scale current value is measured.

REFERENCES:
patent: 2887654 (1959-05-01), Strassman et al.
patent: 3363446 (1968-01-01), Kaley
patent: 4185489 (1980-01-01), Sullivan, Jr.
patent: 4279395 (1981-07-01), Boggio et al.
patent: 4495578 (1985-01-01), Sibley et al.

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