On-board navigation system for motor vehicles

• US 4,891,760 A
• Filed: 09/23/1988
• Issued: 01/02/1990
• Est. Priority Date: 09/29/1987
• Status: Expired due to Term

• Current Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Inventors: Ando, Hitoshi, Kashiwazaki, Takashi
• Primary Examiner(s): Chin, Gary
• Application Number:
  US07/248,092
• Time in Patent Office: 466 Days
• Field of Search: 364/443, 364/449, 364/483, 364/550, 364/521, 73/178 R, 340/988, 340/990, 340/995, 371/66
• US Class Current: 701/200
• CPC Class Codes: G01C 21/26 specially adapted for navigation in a road network
• CPC Class Codes: G09B 29/106 using electronic means

Abstract

An on-board navigation system for motor vehicles comprises a first storage medium in which map data in digital form is stored, a control device for gathering map data of a region having a given area including a present location of the vehicle from a first storage medium, and to display a map on a display screen on the basis of the gathered map data, and a second storage medium of non-volatile type into and from which data is written and read-out. The control device is operative to memorize, at the time of the turn-off of a power supply of the vehicle, data gathered immediately before a fall of the power in the second storage medium, and to display the map at the time of a rise-up of the power supply on the basis of the data memorized in the second storage medium.

Claims

1. An on-board navigation system for a motor vehicle, said on-board navigation system comprising:

first memory means for storing map data in digital form;

control means for gathering map data of a region having a given area including a present location of the vehicle from said first memory means, and to display a map on a display screen on the basis of the gathered map data; and

second memory means of a non-volatile type into and from which said map data is written and read-out, wherein said second memory means is operated by said control means to memorize, at the time of a turn-off of a power supply of the vehicle, said map data gathered immediately before a fall of the power supply of the vehicle , and said display screen displays the map at the time of a return of the power supply on the basis of the map data memorized in the second memory means.

2. An on-board navigation system for a motor vehicle, said on-board navigation system comprising:

first memory means for storing map data in digital form;

control means for performing a control operation to read-out map data of a region having a given area including a present location of the vehicle from the first memory means;

a semiconductor memory for memorizing the map data read-out from the first memory means as image data;

display means for displaying a map on a display screen on the basis of the image data memorized in the semiconductor memory; and

second memory means of a non-volatile type into and from which map data is written and read-out, wherein said second memory means is operated by said control means to memorize, at the time of turn-off of a power supply of the vehicle, said image data at a time immediately before a fall of the power supply, and said display means displays the map at the time of a return of the power supply on the basis of the image data memorized in the second memory means.