Method for determining the course of a land vehicle by comparing signals from wheel sensors with signals of a magnetic sensor
First Claim
1. A method for correcting a course of a land vehicle in a navigation system wherein a driving distance and course changes are derived from wheel pulses generated by sensors in the course of revolution of wheels of a vehicle axle by respectively a preset angle, wherein the course changes derived from the wheel pulses are compared with comparison course changes which are detected with the aid of a magnetic sensor, and wherein correction factors are derived from the result of the comparison and stored, the method comprising the steps of:
- observing the course changes and the comparison course changes over the course of an observation course driven by the vehicle, such that the observation course is greater at higher vehicle speeds than at lower vehicle speeds,calculating a difference between the course changes and the comparison course changes during course changes over said observation course which are greater than a preset minimum value,changing said stored correction factors to provide changed, stored correction factors, as follows;
increasing said stored correction factors if the course changes are less than the comparison course changes, andreducing the stored correction factors if the course changes are greater than the comparison course changes.
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Abstract
In a method for determining the location of a land vehicle wherein the driving distance and course changes are derived from wheel pulses generated by sensors in the course of the revolution of the wheels of a vehicle axle by respectively a preset angle, the course changes derived from the wheel pulses are compared with comparison course changes which are obtained independently of the wheel pulses. Correction values are derived from the result of the comparison. The comparison course changes are preferably detected with the aid of a magnetic sensor (compass).
38 Citations
11 Claims
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1. A method for correcting a course of a land vehicle in a navigation system wherein a driving distance and course changes are derived from wheel pulses generated by sensors in the course of revolution of wheels of a vehicle axle by respectively a preset angle, wherein the course changes derived from the wheel pulses are compared with comparison course changes which are detected with the aid of a magnetic sensor, and wherein correction factors are derived from the result of the comparison and stored, the method comprising the steps of:
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observing the course changes and the comparison course changes over the course of an observation course driven by the vehicle, such that the observation course is greater at higher vehicle speeds than at lower vehicle speeds, calculating a difference between the course changes and the comparison course changes during course changes over said observation course which are greater than a preset minimum value, changing said stored correction factors to provide changed, stored correction factors, as follows; increasing said stored correction factors if the course changes are less than the comparison course changes, and reducing the stored correction factors if the course changes are greater than the comparison course changes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for correcting a course of a land vehicle in a navigation system wherein a driving distance and course changes are derived from wheel pulses generated by sensors in the course of revolution of wheels of a vehicle axle by respectively a preset angle, wherein the course changes derived from the wheel pulses are compared with comparison course changes which are detected with the aid of a magnetic sensor, and wherein correction factors are derived from the result of the comparison and stored, the method comprising the steps of:
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determining an observation course in accordance with travel speed of the vehicle, such that the observation course is greater at higher vehicle speeds than at lower vehicle speeds, observing the course changes and the comparison course changes over the course of the observation course driven by the vehicle, calculating a difference between the course changes and the comparison course changes during course changes over said observation course which are greater than a preset minimum value, changing said stored correction factors to provide changed, stored correction factors, as follows; increasing said stored correction factors if the course changes are less than the comparison course changes, and reducing the stored correction factors if the course changes are greater than the comparison course changes, and the derivation of the correction factors takes place only with course changes which are located by at least a safety distance below a maximum course change determined by lateral guide forces of the wheels as a result of skidding of the vehicle.
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9. A method for correcting a course of a land vehicle in a navigation system wherein a driving distance and course changes are derived from wheel pulses generated by sensors in the course of revolution of wheels of a vehicle axle by respectively a preset angle, wherein the course changes derived from the wheel pulses are compared with comparison course changes which are detected with the aid of a magnetic sensor, and wherein correction factors are derived from the result of the comparison and stored, the method comprising the steps of:
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determining an observation course in accordance with travel speed of the vehicle, such that the observation course is greater at higher vehicle speeds than at lower vehicle speeds, the observation course having a length that is dependent on the vehicle speed and that in a range of approximately 40 to 70 km/h, the length of the observation course is made constant, observing the course changes and the comparison course changes over the course of the observation course driven by the vehicle, calculating a difference between the course changes and the comparison course changes during course changes over said observation course which are greater than a preset minimum value, changing said stored correction factors to provide changed, stored correction factors, as follows; increasing said stored correction factors if the course changes are less than the comparison course changes, and reducing the stored correction factors if the course changes are greater than the comparison course changes.
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10. A method for correcting a course of a land vehicle in a navigation system wherein a driving distance and course changes are derived from wheel pulses generated by sensors in the course of revolution of wheels of a vehicle axle by respectively a preset angle, wherein the course changes derived from the wheel pulses are compared with comparison course changes which are detected with the aid of a magnetic sensor, and wherein correction factors are derived from the result of the comparison and stored, the method comprising the steps of:
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determining an observation course in accordance with travel speed of the vehicle, such that the observation course is greater at higher vehicle speeds than at lower vehicle speeds, observing the course changes and the comparison course changes over the course of the observation course driven by the vehicle, calculating a difference between the course changes and the comparison course changes during course changes over said observation course which are greater than a preset minimum value, changing said stored correction factors to provide changed, stored correction factors, as follows; increasing said stored correction factors if the course changes are less than the comparison course changes, and reducing the stored correction factors if the course changes are greater than the comparison course changes, dividing the observation course into a preset number of observation windows, adding changes of course parameters detected during passage through the observation window in respectively one observation window, and terminating observation over an observation course started for one of the following; (i) recognition of straight-ahead driving, (ii) recognition of a sign of a course change, and (iii) evaluation of cornering, and starting a new observation course if a sensor error has been detected.
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11. A method for correcting a course of a land vehicle in a navigation system wherein a driving distance and course changes are derived from wheel pulses generated by sensors in the course of revolution of wheels of a vehicle axle by respectively a preset angle, Wherein the course changes derived from the wheel pulses are compared with comparison course changes which are detected with the aid of a magnetic sensor, and wherein correction factors are derived from the result of the comparison and stored, the method comprising the steps of:
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determining an observation course in accordance with travel speed of the vehicle, such that the observation course is greater at higher vehicle speeds than at lower vehicle speeds, observing the course changes and the comparison course changes over the course of the observation course driven by the vehicle, calculating a difference between the course changes and the comparison course changes during course changes over said observation course which are greater than a preset minimum value, changing said stored correction factors to provide changed, stored correction factors, as follows; increasing said stored correction factors if the course changes are less than the comparison course changes, and reducing the stored correction factors if the course changes are greater than the comparison course changes, checking measurement values of the comparison course changes for plausibility, and starting a new observation course in case of comparison course changes which have been recognized as being defective.
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Specification