Vehicular navigation apparatus
First Claim
1. A vehicular navigation apparatus comprising:
- a distance sensor for detecting distance travelled and for generating a distance signal;
a vehicle travelling angle sensor for generating a signal for vehicle travelling angle;
a curve detecting unit, provided with inputs of the distance signal and the travelling angle signal, for determining unit changes in vehicle travelling direction per unit of detected distance by applying said vehicle traveling angle signal to a travelling angle-travelling direction conversion means and for integrating said unit changes to obtain a value for travelling direction change;
an exploration unit for receiving inputs of present position and destination and for retrieving a predetermined travelling direction change at an intersection or node based on position data and direction data;
a comparison-decision unit for comparing the retrieved predetermined travelling direction change data with the value for change in vehicle travelling direction determined by said curve detecting unit; and
a guidance processor for providing predetermined guidance responsive to the results of said comparing.
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Accused Products
Abstract
A vehicular navigation apparatus includes a distance sensor (1), a steering angle sensor (3), a curve detecting unit (9) provided with inputs of a distance signal and steering-angle signal for calculating a change in vehicle travelling direction by referring to a steering angle - travelling direction conversion table (17), a course exploration unit (13) provided with inputs of present position and destination for performing course exploration based on intersection data, road data and node data, a comparison-decision unit (11) for comparing retrieved course data and results of curve detection, and a guidance processor (15) for executing predetermined guidance processing based on the results of comparison. Thus, it is determined whether the vehicle has turned at a guidance intersection or node on a predetermined course and whether the vehicle is on the predetermined course. If the vehicle has made a correct turn, present position is calculated by performing a distance correction using intersection position data or node data. When it is determined that the vehicle is off course, the driver is so informed and instructions can be given for measures to be taken subsequently.
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Citations
11 Claims
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1. A vehicular navigation apparatus comprising:
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a distance sensor for detecting distance travelled and for generating a distance signal; a vehicle travelling angle sensor for generating a signal for vehicle travelling angle; a curve detecting unit, provided with inputs of the distance signal and the travelling angle signal, for determining unit changes in vehicle travelling direction per unit of detected distance by applying said vehicle traveling angle signal to a travelling angle-travelling direction conversion means and for integrating said unit changes to obtain a value for travelling direction change; an exploration unit for receiving inputs of present position and destination and for retrieving a predetermined travelling direction change at an intersection or node based on position data and direction data; a comparison-decision unit for comparing the retrieved predetermined travelling direction change data with the value for change in vehicle travelling direction determined by said curve detecting unit; and a guidance processor for providing predetermined guidance responsive to the results of said comparing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification