Vehicle Time Display Device Dynamic Zone Threshold
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Solution Overview
Problem
Existing time information display devices in vehicles face inaccuracies in determining time zone changes due to GPS position errors and outdated map information, leading to frequent and incorrect time fluctuations near time zone boundaries.
Innovation Solution
A time information display device that receives time zone information from multiple external devices, calculates the accumulated match time of consistent time zone data, and displays the correct time zone based on a predetermined threshold, adjusting for vehicle speed, time zone boundary angle, road linearity, and location accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the predetermined distance area from the time zone boundary is enlarged to avoid frequent time changes, then the frequency of displayed time changes is reduced, but the time may be displayed incorrectly over a needlessly wide area
Solution Approach 1:
The patent applies dynamics by making the predetermined distance variable rather than fixed. The control device dynamically adjusts the predetermined distance based on GPS location accuracy and vehicle speed. When GPS accuracy is low or vehicle speed is high, the predetermined distance is increased to prevent frequent time changes. When GPS accuracy is high or vehicle speed is low, the predetermined distance is decreased to improve time zone determination precision. This dynamic adjustment resolves the contradiction between stability and precision.
Solution Approach 2:
The patent changes the parameter of predetermined distance based on operating conditions (GPS accuracy and vehicle speed). By adjusting this parameter dynamically, the system optimizes the balance between preventing frequent time changes and maintaining accurate time zone determination. The control device calculates appropriate predetermined distance values according to current GPS accuracy and vehicle speed, thereby adapting the system behavior to current conditions.
2Device complexity
If map information is updated only at the time of vehicle inspection, then device complexity and update frequency are reduced, but position location accuracy by map matching deteriorates
Solution Approach 1:
The patent applies self-service by enabling the navigation device to automatically update map information through network communication without requiring manual intervention or frequent vehicle inspections. The control device automatically determines whether map updates are needed and performs updates when connected to a network, maintaining simplicity while improving position location accuracy through current map data.
3Measurement precision
If GPS position calculation error is reduced by using multiple external devices, then time zone determination accuracy is improved, but device complexity increases
Solution Approach 1:
The patent uses map information as an intermediary to resolve position ambiguity. When GPS position calculation yields multiple possible locations, the control device refers to map information (road data, terrain data) to determine which calculated position is most likely correct. This intermediary approach improves time zone determination accuracy without requiring complex additional hardware, as the map information already exists in the navigation device.
Data Source
AI summary
An information display device includes: a communications part that receives, from multiple external devices, information on a time zone of the current position identified by the multiple external devices; a time zone-identification part that identifies a time zone of the current position of the self-device, on the basis of the information received from the multiple external devices; and a display control part that displays time in the identified time zone of the current position on a display part, in which the time zone-identification part repeatedly calculates, for a first predetermined time length, an accumulated time in which time zones received from a predetermined number of the external devices match one another, and when the accumulated match time is not shorter than a predetermined time, identifies the matched time zone as the time zone of the current position.