摘要:
Augmenting the GPS receiver (30) with some form of Dead Reckoning (DR) (40), to fill in the gaps occurring as a result of loss of GPS coverage and improve the accuracy of the GPS trajectory. A DR system (40) may take the form of a differential odometry system having separate left and right wheel sensors (73, 74) installed in the vehicle (10) to provide an indication of the speed of each wheel. However, the accuracy of the DR system (40) is critically dependent upon the accuracy to which the vehicle's (10) heading is determined.
摘要:
Eine Fahrzeugpositions-Anzeigeeinrichtung mit einem Fahrtweg-Geber, einem Fahrtrichtungs-Geber und einer Recheneinheit, die auf der Grundlage der beiden Geber eine der jeweilien Fahrtroute entsprechende Information ausgibt verwendet als Fahrtweg- und als Fahrtrichtungs-Geber zwei gleichartige Rad-Umdrehungs-Sensoren an den beiden Rädern einer Achse. Ein weiterer Fahrtrichtungs-Geber ist zur Korrektur des mit Hilfe der Rad-Umdrehungs-Sensoren gelieferten Information über die Fahrtrichtung nur kurzzeitig einschaltbar.
摘要:
Zur autarken Kursbestimmung eines Landfahrzeugs kann ein Fahrdaten auswertender Sensor mit einem Erdmagnetfelddaten auswertenden Sensor kombiniert werden. Auf diese Weise lassen sich die Vorteile einer Kurzstreckenstabilität des Fahrdaten auswertenden Sensors mit einer Langstreckenstabilität des Erdmagnetfelddaten auswertenden Sensors verbinden. Besonders günstige Ergebnisse werden erzielt, wenn die Ausgangssignale des Fahrdaten auswertenden Sensors über einen Hochpaß und die Ausgangssignale des Erdmagnetfelddaten auswertenden Sensors über einen Tiefpaß geführt und beide Signale anschließend addiert werden. Die Erfindung ist zur Ergänzung eines stadtplangestützten elektronischen Ortungs- und Navigationssystem für Autofahrer anwendbar.
摘要:
The invention relates to a device that can be provided on a vehicle (1, 2), including at least: a first sensor (30) placed on the side of the vehicle facing the entrance to a parking area, said sensor — which can be a lidar — takes measurements of the distance and orientation of the vehicle relative to the area, based on the reconstruction of a cloud of points belonging to the surface of said walls; a series of sensors (31) placed on the lateral sides of the vehicle, intended for measuring the distance from said sides to the side walls of the parking area, said sensors optionally being ultrasonic or optical; processing means (39) calculating the position and the relative orientation of the vehicle relative to the walls in accordance with the measurements of the various sensors and in accordance with the various phases of the parking manoeuvre.
摘要:
The invention is intended for conserving energy expended by railway rolling stock, for instance by a locomotive when carrying out train operations and shunting, when trains are run in an automatic mode or in a train operator assistance mode. A method for increasing the efficiency of rolling stock includes the following steps: obtaining the parameters of the rolling stock, including at least the following: speed, coordinates, overhead system voltage, traction engine current voltage, brake line discharging; in addition, determining at least the dependence parameters of an active traction force, braking force, motion resistance force, force of wheel adherence to the rails, and the mass of the rolling stock; then, determining the optimal control to be carried out by traction and braking equipment of railway rolling stock based on the dependence parameters obtained during the previous step; then, transmitting the optimal control, determined during the previous step, to a rolling stock control system for implementation or for displaying to the train operator.
摘要:
Position ( x ref ) and heading ( H ) of a vehicle are tracked using wheel tick numbers coming from wheel tick units (5a, 5b) at the front wheels (3a; 3b) only from which a velocity (ν) and a heading rate ( h ) are calculated. The calculations are based on an intermediate wheel angle (δ). An exact solution δ ex for the same depends on the velocities of the left front wheel ν l and of the right front wheel ν r according to δ ex = arctan 2 p a 1 + p 2 + 1 - p 2 2 - 2 p a 2 where p = v l - v r v l + v r . . An approximate solution δ app is calculated according to the simpler formula δ app = ½ arcsin 2 p a and used wherever its deviation from the exact solution δ ex is not significant, i.e., where the latter is not larger than a threshold wheel angle δ thr . Only for δ app >δ thr where the deviation is larger than, e.g., 2° or, preferably, 1°, the wheel angle according to the exact solution δ ex is used. The latter is determined in that the approximate solution δ app is first established and the corresponding exact solution δ ex read from a look-up table, interpolation being used if necessary.