Method and apparatus for display of distance and direction to destination
First Claim
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1. A method for displaying a running position of an automobile comprising the steps of:
- calculating and storing coordinate components of a vector value from a starting position to a destination at a starting position, said coordinate components defining a stored distance signal at said starting position;
generating and storing a signal, at the starting position, representing an absolute direction of the destination with respect to the starting position by detecting terrestrial magnetism;
generating, during running, wheel rotation signals by detecting rotation of left and right wheels of the automobile;
calculating, during running, a running distance by using said generated wheel rotation signals;
calculating, during running, a turning angle by using said generated wheel rotation signals;
calculating, during running, a distance to the destination from the present running position. by using said stored distance signal at the starting position and said calculated distance during running;
calculating, during running, an absolute direction of the destination with respect to the present running position by using said stored absolute direction signal at the starting position and said calculated turning angle during running; and
displaying the positional relationship between the present running position of the automobile and the destination on the basis of the result of said calculations.
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Abstract
A method for displaying positional relation between the present running position of an automobile and a destination, on the basis of the wheel rotation signals generated by detecting rotation of left and right wheels of the automobile, setting signals selected at a starting position to represent a distance to the destination from the starting position and a direction of the destination from the starting point, and a direction signal indicating a running direction of the automobile.
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Citations
8 Claims
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1. A method for displaying a running position of an automobile comprising the steps of:
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calculating and storing coordinate components of a vector value from a starting position to a destination at a starting position, said coordinate components defining a stored distance signal at said starting position; generating and storing a signal, at the starting position, representing an absolute direction of the destination with respect to the starting position by detecting terrestrial magnetism; generating, during running, wheel rotation signals by detecting rotation of left and right wheels of the automobile; calculating, during running, a running distance by using said generated wheel rotation signals; calculating, during running, a turning angle by using said generated wheel rotation signals; calculating, during running, a distance to the destination from the present running position. by using said stored distance signal at the starting position and said calculated distance during running; calculating, during running, an absolute direction of the destination with respect to the present running position by using said stored absolute direction signal at the starting position and said calculated turning angle during running; and displaying the positional relationship between the present running position of the automobile and the destination on the basis of the result of said calculations.
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2. A method for displaying a running position of an automobile comprising the steps of:
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deciding, first, whether or not a set signal associated with a setting of destination distance and direction is generated; when said set signal is generated, calculating and storing values X,Y of a vector from a starting position to destination; calculating and storing an automobile running direction α
using a running direction signal from means for detecting a running direction by terrestrial magnetism;reading-in pulse number Nl and Nr of wheel rotational signals from means for detecting left and right wheel rotations; obtaining an automobile running distance L by summing the read-in Nl and Nr and multiplying the results of the summation by a predetermined constant; deciding, second, whether or not the obtained automobile running distance L is equal to a predetermined distance; when the running distance L is equal to a predetermined distance, obtaining an automobile turning angle α
by carrying out subtraction between the read-in Nl and Nr and multiplying the results of the subttaction bv a predetermined constant;calculating and storing values x, y of a vector from the starting position to the present running position using said predetermined distance, the stored calculated automobile running direction α and
the obtained automobile turning angle θ
;obtaining values X'"'"', Y'"'"' of a vector from the present running position to the destination by carrying out subtraction between the stored calculated value X, Y and the stored calculated values X'"'"', Y'"'"';
replacing the values X, Y with the obtained values X'"'"', Y'"'"' and storing the values X'"'"', Y'"'"'; andcalculating a straight distance of the destination from the present running position and the direction of the destination from the present running position using the stored calculated values X'"'"', Y'"'"' and displaying the calculated distance and the direction on a display means as a distance indication signal and a direction indication signal. - View Dependent Claims (3, 4)
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5. A device for displaying a running position of an automobile comprising:
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means for calculating coordinate components of a vector value from a starting position to a destination at a starting position; means for generating a signal, at the starting position, to represent an absolute direction of the destination with respect to the starting position by detecting terrestrial magnetism; means for generating, during running, wheel rotation signals by detecting rotation of left and right wheels of the automobile; control means for calculating, during running, a running distance by using said generated wheel rotation signals, for calculating, during running, a turning angle by using said generated wheel rotation signals, for calculating, during running, a distance to the destination from the present running position by using said calculated coordinate components of a vector value from a starting position to a destination and said calculated distance during running; and
for calculating, during running, an absolute direction of the destination with respect to the present running position by using said absolute direction signal and said calculated turning angle during running; andmeans for displaying the positional relationship between the present running position of the automobile and the destination on the basis of the result of said calculations. - View Dependent Claims (6, 7, 8)
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Specification