Automotive navigation system

• US 5,742,925 A
• Filed: 05/06/1996
• Issued: 04/21/1998
• Est. Priority Date: 05/08/1995
• Status: Expired due to Term

• Current Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Inventors: Baba, Toshiharu
• Primary Examiner(s): Chin, Gary
• Application Number:
  US08/642,870
• Time in Patent Office: 715 Days
• Field of Search: 364/571.01, 364/571.04, 701/200, 701/207, 701/213, 701/214, 701/216, 701/220, 701/221, 73/178 R, 340/988, 340/990, 340/995
• US Class Current: 701/221
• CPC Class Codes: G01C 21/28 with correlation of data from several navigational instruments

Abstract

An angular velocity sensor is provided for detecting an angular velocity of a motor vehicle. A right turn and left turn of the motor vehicle are detected. In response to the detected right turn and left turn, positive and negative correction coefficients are obtained. The detected angular velocity is corrected with either of the correction coefficients. A bearing of the motor vehicle is calculated with a corrected angular velocity.

Claims

1. An automotive navigation system comprising:

an angular velocity sensor for detecting an angular velocity of a motor vehicle;

first determining means for determining a right turn of the motor vehicle and for producing a right turn signal when determined;

second determining means for determining a left turn of the motor vehicle and for producing a left turn signal when determined;

first adjusting means responsive to the right turn signal for producing a positive correction coefficient for correcting the angular velocity detected by the angular velocity sensor at the right turn;

second adjusting means responsive to the left turn signal for producing a negative correction coefficient for correcting the angular velocity detected by the angular velocity sensor at the left turn;

selecting means for selecting either of the positive correction coefficient or the negative correction coefficient;

correcting means for correcting the detected angular velocity with the selected correction coefficient;

calculator means for calculating a bearing of the motor vehicle with the corrected angular velocity.

3. The system according to claim 1 further comprising a GPS for obtaining bearings data, comparator means for comparing the bearing calculated by the calculator means with the bearing data, means for adjusting either of the positive correction coefficient or the negative correction coefficient with a result of the comparison.

2. An automotive navigation system comprising:

an angular velocity sensor for detecting an angular velocity of a motor vehicle;

first determining means for determining a right turn of the motor vehicle and for producing a right turn signal when determined;

second determining means for determining a left turn of the motor vehicle and for producing a left turn signal when determined;

first adjusting means responsive to the right turn signal for producing a positive correction coefficient for correcting the angular velocity detected by the angular velocity sensor at the right turn;

second adjusting means responsive to the left turn signal for producing a negative correction coefficient for correcting the angular velocity detected by the angular velocity sensor at the left turn;

first correcting means for correcting the detected angular velocity with the positive correction coefficient;

second correcting means for correcting the detected angular velocity with the negative correction coefficient;

selecting means for selecting either of the corrected angular velocity with the positive correction coefficient or the negative correction coefficient in accordance with a bearing of the motor vehicle;

calculator means for calculating the bearing of the motor vehicle with the selected corrected angular velocity.