Boots – shoes – and leggings
Patent
1989-08-23
1991-08-27
Chin, Gary
Boots, shoes, and leggings
364444, 340988, 340995, 73178R, G06F 1550
Patent
active
050439022
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a vehicular navigation apparatus for navigating in accordance with a predetermined route. The navigation apparatus is adapted to enter a number of characteristic points on a course as node data, compare an angle at which the vehicle is to turn at a guidance intersection or node with a detected angle of a turn actually made, calculate present position by performing a distance correction on the assumption that a turn has been made at the intersection or node at which the turn is to be made if the difference between the angles is less than a predetermined value, detect that the vehicle has strayed off course and, if the vehicle is off course, provide instructions with regard to subsequent measures or new course guidance.
2. Background Art
Conventionally, a vehicular navigation apparatus is equipped with a distance sensor for detecting the travelling distance of the vehicle, an orientation sensor such as a geomagnetic sensor or gyro for detecting the travelling bearing of the vehicle, and a map memory device comprising a video disk, video tape CDROM or the like. In the proposed apparatus, map data of a specific region are read out of the map memory device as necessary to display a map image, the travelling trajectory and present position of the vehicle are displayed on the displayed image, the driver visually verifies the vehicle position and confirms the present position, and the present position obtained is compared with the map data to revise the present position or inform the driver, as by means of a buzzer, whether the vehicle has strayed from a predetermined course.
However, if geomagnetism is detected by a geomagnetic sensor in a system in which a predetermined course of travel and the travelling trajectory are displayed, errors in bearing detection can arise at locations where there is magnetic disturbance, as at railroad crossings, along railways and near high-tension lines, or due to magnetization of the vehicle body. As a result, present position cannot be detected with very good precision. In addition, gyros are high in cost. Furthermore, the method of correcting present position by comparing calculated values with map data involves large quantities of data and considerable processing time.
Furthermore, since the vehicle must be driven while the operator constantly verifies whether the vehicle is travelling in accordance with the predetermined course or whether the vehicle has strayed off course, a hazardous situation arises in which the driver is not capable of paying full attention to driving.
With the system in which it is determined whether the vehicle has strayed off the predetermined course and the driver is so informed by a buzzer, there are no instructions given to the driver with regard to what should be done from the point at which the vehicle has gone astray. Consequently, it is difficult for the driver to return and pick up the predetermined course.
The present invention has been devised in order to solve the aforementioned problems and its object is to provide a vehicular navigation apparatus in which distance can be revised accurately at every intersection without being affected by disturbances, present position is calculated with little data, processing speed is improved, straying off course can be quickly determined, it is unnecessary to return to a previously traversed point when a new course is found, it is possible to promptly return to the point at which the vehicle went astray if a new course cannot be found, and the driver is capable of driving the vehicle safely.
DISCLOSURE OF THE INVENTION
To these ends, the vehicular navigation apparatus of the present invention is characterized by comprising a distance sensor, a steering angle sensor, a curve detecting unit 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, a course exploration unit provided with inputs of present posit
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Nanba Akimasa
Yokoyama Shoji
Aisin Aw Co. Ltd.
Chin Gary
Kabushiki Kaisha Sinsangyokaihatsu
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