05828585 is referenced by 46 patents and cites 4 patents.

A system and method of automatically calibrating a vehicle speed sensor signal to provide an accurate speed signal for use in vehicle systems such as a navigation system. The navigation system receives GPS position information signals which are processed to determine current position. A compass provides an indication of the vehicle heading. The navigation system receives the vehicle speed sensor signal and counts the number of signal pulses during a time period. The system determines a pulse ratio of the vehicle speed sensor as a function of a GPS determined speed and the pulse count. The pulse ratio is subsequently used to calibrate the vehicle speed sensor signal. With the navigation system, the calibrated vehicle speed signal is used in connection with a dead reckoning technique for determining the position of the vehicle when GPS signals are unavailable.

Title
Vehicle speed signal calibration
Application Number
8/785182
Publication Number
5828585
Application Date
January 17, 1997
Publication Date
October 27, 1998
Inventor
Thac Dinh Nguyen
Westfield
IN, US
Douglas Lynn Welk
Rossville
IN, US
Agent
Jimmy L Funke
Assignee
Delco Electronics Corporation
IN, US
IPC
G01C 25/00
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