| 摘要 |
An electronic speedometer/acceleration indicator (40) for large vehicles such as railroad locomotives, transit railcars, and off-highway types featuring a transflective, backlighted display (30, 40). Prominently displayed, conveniently viewed indications (42) of the rate of change at any indicated speed provide immediate information for use in power application and braking of the vehicle by the operator. The display provides in an analog configuration (32, 39), means for displaying digitally processed speed information. Computation of vehicular speed, acceleration and/or deceleration is provided on a continuous basis, utilizing a microprocessor (10) to sample and average speeds over a fixed time interval which includes sufficient interval to prevent display fluctuations or ''jittering''. A novel user initiated test (Fig. 3-1) cycles the microprocessor and associated digital components through predetermined operational sequences, with prominent indication of unit failure on the display means.
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