Railway rolling stock – Trucks – Bogie
Patent
1996-10-15
1998-07-07
Morano, S. Joseph
Railway rolling stock
Trucks
Bogie
B61F 500
Patent
active
057752303
DESCRIPTION:
BRIEF SUMMARY
In rail vehicles, particularly those used for the transportation of persons, it is known to so incline the lateral inclination of the load-bearing floor, i.e. that surface on which a load such as the persons, is carried, as a function of the lateral accelerations which take place upon travel around curves, so that the acceleration resulting from the acceleration due to gravity and the lateral acceleration is applied to the load, insofar as possible, in a direction perpendicular to the load-bearing floor.
The transverse acceleration is dependent on the radius of the curve, the speed of travel, the angle with respect to the truck by which the load-bearing floor is to be set in order to satisfy the above-mentioned conditions and, furthermore, on the banking of the rail.
Various attempts to solve this problem are known. Reference may be had to Federal Republic of Germany Utility Model 93 13 792.3, WO 91/00815, EP-A 0 184 960, DE-OS 22 05 858, and CH-A 534 391.
In this connection, the instantaneous lateral acceleration is fundamentally determined on the vehicle by measurement, for which suitable measuring devices such as a gyroscope, pendulum, etc. are provided on the vehicle. As a function of the instantaneous measurements, the actuator for the lateral inclination of the load-bearing floor is acted on by open-loop or closed-loop control. In this connection, the simplest possibility for adjusting the position is the use of a pendulum the deflection of which is a direct measure of the angle of lateral inclination of the load-bearing floor to be set since, after all, the weight of the load does not form part of the acceleration considerations.
All of these attempts have one essential disadvantage, namely that at the time when conditions of lateral acceleration are detected by measurement, it is already too late to adjust the lateral acceleration of the load-bearing floor. The lateral inclination set always lags behind the actual requirements at the moment. This leads to relatively complicated attempts at solutions by signals which are directed at detecting the commencement of travel around a curve as early as possible, for which, for example, the swinging of the truck is suitable as a measured variable.
The object of the present invention is to create a guidance system which comprises: direction and having an inclination setting device which acts on the load-bearing floor, as well as a setting-device control which adjusts the inclination of the load-bearing floor in such a manner that disturbing influences of lateral acceleration are reduced,
Preferred embodiments of this guidance system and the control method of the invention, will be explained below, by way of example, with reference to the figures of the drawing, in which:
FIG. 1 shows, in the form of a simplified signal-flow/function-block diagram, a first possible form of the guidance system of the invention which operates in accordance with the method of the invention on a rail vehicle in accordance with the invention;
FIG. 2 in a view similar to that of FIG. 1, shows a preferred embodiment of the guidance system of the invention;
FIG. 3 shows, on the basis of a simplified function-block/signal-flow diagram, another embodiment of the invention, in which the stretch of track for a rail vehicle is itself used as inherent memory;
FIG. 4 shows, on basis of a simplified function-block/signal-flow diagram, a further development of the system of the invention, with the addition of a redundancy system;
FIG. 5 shows diagrammatically an implementation of two guidance systems of the invention as master and slave, as preferred embodiment of redundant systems.
FIG. 1 shows, on basis of a signal-flow/function-block diagram, the guidance system of the invention in a first embodiment, operating in accordance with the method of the invention.
By means of a position detector 1, the instantaneous position of the rail vehicle, shown diagrammatically at 3, on rails 5 is determined. On the detector 1, or the position-detection device 1, there appears, on the output side, a signa
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Fiat-Sig Schienenfahrzeuge AG
Morano S. Joseph
LandOfFree
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