DIGITAL SPEEDOMETER FOR POLICE VEHICLE APPLICATIONS

Previously, a mechanically driven analog display speedometer was used for police vehicle applications. The speedometer required special processing to meet the tight accuracy requirements of +/- 4.83 kph (+/- 3 mph) over a speed range of 32.2 kph (20 mph) to 160.9 kph (100 mph). For the 1991 police vehicle, the speedometer accuracy requirements changed to +/- 3.22 kph (+/- 2 mph) over the same range. This change, along with the speedometer design criteria, resulted in the change from a mechanically driven speedometer to a digital speedometer. This digital speedometer was packaged in an existing cluster design in a timely manner and for a minimal investment. Special design considerations included minimizing radiated emissions in the police band frequencies and allowing only the speedometer to be turned off during special nighttime driving conditions.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/1560913495
• Supplemental Notes:
  • This paper appears in SAE SP-964, "Automotive Display Systems and IVHS".
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Eldon, T A
• Publication Date: 1993-3

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 41-44
• Serial:
  • SAE Special Publications
  • Publisher: Society of Automotive Engineers (SAE)

Subject/Index Terms

• TRT Terms: Accuracy; Design; Police vehicles
• Uncontrolled Terms: Design features
• Old TRIS Terms: Digital speedometers
• Subject Areas: Design; Highways; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00634508
• Record Type: Publication
• ISBN: 1560913495
• Report/Paper Numbers: SAE/SP-93/964, Paper 930455, Paper 930456
• Files: TRIS
• Created Date: Aug 23 1993 12:00AM