Vehicle navigation device

Patent metadata

Field	Value
Publication number	US-9766770-B2
Application number	US-201314761276-A
Country	US
Kind code	B2
Filing date	Dec 23, 2013
Priority date	Jan 18, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A vehicle navigation device includes a detection portion detecting a position and a travel direction of a vehicle, an arithmetic processing portion specifying the position and the travel direction of the vehicle, a display portion, and a control portion controlling the display portion to display vehicle mark on road map in normal display style. The arithmetic processing portion performs zero point correction to set zero point for an output from a gyro sensor. The control portion switches the display style from the normal display style to a correction-oriented display style in which display information is limited in response to the startup of the vehicle navigation device, and maintains the correction-oriented display style during a zero point correction period that is elapsed from the startup of the vehicle navigation device to a completion of the zero point correction.

First claim

What is claimed is:

1. A vehicle navigation device comprising:
a detection portion detecting a position and a travel direction of a vehicle and outputting a detection signal;
an arithmetic processing portion specifying the position and the travel direction of the vehicle based on the detection signal output from the detection portion;
a display portion displaying a road map and a vehicle mark corresponding to a display style; and
a control portion controlling the display portion to display the vehicle mark on the road map in a normal display style, the vehicle mark in the normal display style indicating both the position and the travel direction of the vehicle specified by the arithmetic processing portion, wherein
the detection portion includes a gyro sensor that detects an angular velocity of the vehicle,
the arithmetic processing portion performs a zero point correction in order to set a zero point for an output from the gyro sensor under a condition that the vehicle maintains a stationary state after a startup of the vehicle navigation device,
the control portion switches the display style of the display portion from the normal display style to a correction-oriented display style in response to the startup of the vehicle navigation device, the correction-oriented display style limits display information that is available in the normal display style, and the control portion maintains the correction-oriented display style as the display style of the display portion during a zero point correction period that is elapsed from the startup of the vehicle navigation device to a completion of the zero point correction,
the zero point correction period includes a first period and a second period,
the first period is a period that is elapsed from the startup of the vehicle navigation device to a stabilization of the output from the gyro sensor, and the second period is a period that is elapsed from the stabilization of the output from the gyro sensor to the completion of the zero point correction,
when the vehicle starts to travel during the first period, the control portion controls the display portion to display, in the correction-oriented display style, an initial display window indicating that the startup of the vehicle navigation device is in progress until the arithmetic processing portion completes a next zero point correction, and
when the vehicle starts to travel during the second period, the control portion controls the display portion to display, in the correction-oriented display style, a movement of the vehicle on the road map in an indistinct manner compared with the normal display style until the arithmetic processing portion completes the next zero point correction.

2. The vehicle navigation device according to claim 1 , wherein,
in the correction-oriented display style maintained during the zero point correction period, the control portion controls the display portion to display an initial display window indicating that the startup of the vehicle navigation device is in progress.

3. The vehicle navigation device according to claim 1 , wherein,
in the correction-oriented display style maintained during the zero point correction period, the control portion controls the display portion to display a movement of the vehicle on the road map in an indistinct manner compared with the normal display style.

4. The navigation device according to claim 1 , wherein
the detection portion further includes the arithmetic processing portion and the detection portion is configured as a detection unit,
the display portion and the control portion are configured as a navigation device body separately from the detection unit,
the detection unit and the navigation device body are communicable with each other, and
the detection unit is supplied with power by the navigation device body and starts to operate after a startup of the navigation device body.

5. The navigation device according to claim 3 , wherein
the display portion displays a vehicle mark indicating only the position of the vehicle on the road map as the display of the movement of the vehicle in the indistinct manner.

Assignees

• Denso Corp

Inventors

• Ebi Masaki

Classifications

• G06T11/26

  Drawing of charts or graphs · CPC title

• G06F3/0481 Primary

  based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance · CPC title

• G06T11/206

  Physics · mapped topic

• G01C25/005

  initial alignment, calibration or starting-up of inertial devices · CPC title

• G01C21/36

  Input/output arrangements for on-board computers · CPC title