Boots – shoes – and leggings
Patent
1987-01-30
1989-03-21
Chin, Gary
Boots, shoes, and leggings
364449, 36457104, 73178R, 340988, G06F 1550
Patent
active
048149896
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a navigation method for vehicles, having a display arrangement, as generically defined by the preamble to the main claim.
In a known navigation system according to published German patent application DE-OS No. 33 19 207, before the trip begins the data for various destinations are input into a memory via an input device, and then the next destination to be headed for is called up. Via a composite navigation, the instantaneous location of the vehicle is ascertained continuously during the trip, and from this location the particular distance and direction toward the destination called up are displayed. On reaching the destination, all the errors in navigation that have occurred during the trip can be eliminated by pressing a correction key, so that for the subsequently called-up destination, composite navigation can again be done on the basis of correct initial coordinates.
With this system it is disadvantageous that the system errors caused by the composite navigation system occur again and again, to the same extent, in subsequent trips. An inaccuracy caused by the composite system, once present, can thus be ascertained, but not eliminated. This also applies for errors occurring because of changes in the tire size, in the tread, tire pressure, load and declination, and as a result of magnetic interference fields that vary over time.
With the present invention, the goal is to increase the accuracy of the composite navigation system with the number of trips to a destination.
ADVANTAGES OF THE INVENTION
The method according to the invention having the characteristics of the main claim has the advantage that at the end of each trip to a destination, the deviations ascertained between the input destination and the destination ascertained by the navigation system are used to recalibrate angle code numbers and travel distance code numbers of the navigation system, in order to optimize the accuracy of the composite navigation. This is particularly advantageous in navigation systems in which the operating parameters, such as the declination angle or the size and orientation of the internal magnetic field of the vehicle, lead to errors in navigation as they vary over the long term.
By means of the measures disclosed in the dependent claims, advantageous further developments of and improvements to the characteristics disclosed in the main claim are possible. A particularly simple and advantageous solution is that for calculating a correction value, the direct distance of the input destination is set as a ratio to the direct distance from the starting point ascertained by the composite navigation system, and that for calculating an angle correction, the angular deviation between the direction of the destination input into the memory and the direction of the starting point, ascertained by the composite navigation system, is set in proportion to the distance of the destination.
DRAWING
An exemplary embodiment of the invention is shown in the drawing and described in further detail in the ensuing description. Shown are:
FIG. 1, a navigation system for a motor vehicle in a block circuit diagram;
FIG. 2, the schematic representation of deviations between a trip to a destination that is input and a trip to a destination that is ascertained by the navigation system;
FIG. 3, a trip to a destination of this kind, comprising a plurality of stages, shown schematically; and
FIG. 4 shows a flow chart of the navigation method with the recalibration upon reaching the destination.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
In FIG. 1, a composite navigation system for motor vehicles is shown, with which the driver, by indicating the direction of the destination and the line of sight distance, can find the desired destination in strange surroundings (known as a destination finding system). It comprises an input and output unit 10, a microprocessor 11 having a data memory 12, and a travel transducer 13 and trip direction transducer 14. The microprocessor 11 is conventionally contained along with
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Dobereiner Klaus
Kanzler Ulrich
Rauch Hans
Chin Gary
Ottesen Walter
Robert & Bosch GmbH
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