Railway rolling stock – Trucks – Bogie
Patent
1997-06-18
1998-07-28
Morano, S. Joseph
Railway rolling stock
Trucks
Bogie
B61F 524
Patent
active
057849692
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process and device or regulating the earth-related inclination of rail boxes in railway vehicles.
BACKGROUND INFORMATION
When rail vehicles travel on a curve, the centrifugal force acting on the passengers and transported goods causes a transverse acceleration that should be minimized to improve comfort and safety without unnecessarily reducing travel speed at the expense of travel time and shipping capacity at the same time. Because of rising demands, an attempt has been made to supplement railway engineering measures (banking in curves) by measures implemented in the railway vehicle itself. Some of the transverse acceleration acting on the passengers can be neutralized with the help of gravity. European Patent A 557,893 and Swedish Patent B 442,846 disclose methods of controlling the inclination of a rail vehicle box relative to the bogie on which it is supported with the goal of reducing transverse acceleration.
European Patent A 557,893 discloses a system where the inclination of the box relative to the bogie is controlled by regulating the transverse acceleration in the vehicle, which requires a precontrol device to detect a curve in the track by means of centrifugal sensors. Furthermore, an additional setpoint must be defined for the angle between the box and the bogie. In the known case, the quality of the control depends on the precontrol and requires a knowledge of the design of the track curves on which the vehicle is to travel.
Swedish Patent B 442,846 discloses a system where the setpoint of the angle between the box and the bogie is determined from the acceleration values in the engine and from an additional setpoint determined from the angle difference between the front bogie and the rear bogie. This inclination system is based on a certain geometry of the track banking. This system can misinterpret a defect in track banking in a straight line of track as banking in a curve, which would thus result in an unwanted reaction in angle of slope having the wrong plus or minus sign. In addition, the front vehicle unit cannot be regulated optimally because of the long processing times for the acceleration signal.
German Patent A 2,705,221 discloses an arrangement for controlling an inclination device with which the inclination of a box can be adjusted in relation to the bogie of the vehicle. In this arrangement the uncompensated transverse acceleration is controlled by sending to the inclination device a signal representing the difference between the centrifugal acceleration in the horizontal plane, which is weighted with one factor, and the absolute inclination of the box, which is weighted with a different factor.
The arrangement according to German Patent A 2,705,221 is controlled by a process that includes the following steps: the earth as an inertial system, earth as an inertial system is determined, setpoint and the actual value of the absolute inclination of the box, travel as a function of the control signal thus formed.
It is thus impossible with the control process disclosed in German Patent A 2,705,221 to freely select a setpoint for the absolute inclination of the box as a function of he travel situation--i.e., not to allow the vehicle to incline below a minimum speed or below minimum curve radii--or to freely design a controller for the absolute angle of inclination which has a significant influence on the uncompensated transverse acceleration.
European Patent A 271,592 discloses a process for regulating the inclination and a device for carrying out this process. In this process, the railway line information is stored in a mass storage device. For each storage section width (e.g., 1 m) the track radius and the banking of the curve must be entered by measuring the track. Thus, the information for each line of track on which the vehicle is to run with regulated inclination must first be compiled in a demanding data acquisition process. The inclination of the vehicle cannot be regulated over routes not included in the mass storag
REFERENCES:
patent: 3717104 (1973-02-01), Law et al.
patent: 4440093 (1984-04-01), Kakehi et al.
patent: 5295443 (1994-03-01), Bangtsson et al.
patent: 5454329 (1995-10-01), Liprandi et al.
patent: 5564342 (1996-10-01), Casetta et al.
Drucke Peter
Jungkunz Clemens
Muller Herbert
Niemeyer-Stein Werner
Rath Bernhard
Morano S. Joseph
Siemens Aktiengesellschaft
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