METHOD FOR CONTROLLING AN ANTISLIP-REGULATED FRICTION BRAKE SYSTEM OF A RAIL VEHICLE

• US 20130261924A1
• Filed: 10/17/2011
• Published: 10/03/2013
• Est. Priority Date: 10/22/2010
• Status: Active Grant

• Current Assignee: Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH (Estate of Heinz Hermann Thiele)
• Original Assignee: Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH (Estate of Heinz Hermann Thiele)
• Inventors: Herden, Marc-Oliver, Englbrecht, Matthaeus, Trinkberger, Andreas
• Granted Patent: US 8,972,144 B2
• Time in Patent Office: Days
• US Class Current: 701/81
• CPC Class Codes: B60T 13/665 the systems being specially adapted for transferring two or more command signals, e.g. railway systems B60T13/662 takes precedence
• CPC Class Codes: B60T 17/228 for railway vehicles
• CPC Class Codes: B60T 8/1705 for rail vehicles
• CPC Class Codes: B60T 8/1761 responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
• CPC Class Codes: B60T 8/17616 Microprocessor-based systems
• CPC Class Codes: B60T 8/3235 Systems specially adapted for rail vehicles

Abstract

A method for controlling an antislip-regulated friction brake system of a rail vehicle or rail vehicle train having a number of braked axles which subjects at least two selected axles to a braking pressure exceeding the braking pressure required for braking; measures at least one variable representing the maximum transmittable frictional force in each case between the wheels of the selected axles and the rail; prepares a list associating the selected axles with the respectively transmittable brake friction force; identifies at least one brake-slipping axle from the selected axles in which a brake slip exceeding a predetermined extent occurs; calculates lost braking work; identifies from the list at least one axle in which brake-slipping does not occur or occurs to a permissible extent; and applies the brakes on at least one axle.

Claims

1. A method for controlling an antislip-regulated friction brake system of a rail vehicle or of a rail vehicle train which is composed of a plurality of rail vehicles and which has a number of braked axles, comprising:

a) subjecting at least two selected axles of the number of braked axles during braking to a braking pressure which exceeds a braking pressure corresponding to the braking request for the braking;

b) measuring at least one variable representing the maximum transmittable frictional force in each case between the wheels of the selected axles and the rail, such as the wheel rotational speed, wheel circumferential acceleration, braking force, braking torque or braking pressure;

c) preparing a list in which the selected axles are assigned to their respectively transmittable braking frictional force;

d) identifying at least one axle with brake slip from the selected axles, at which axle, during braking, a brake slip which exceeds a predefined extent occurs and therefore the antislip regulation is activated;

e) calculating lost braking work at the at least one axle with brake slip from the difference between the braking work which would have been carried out without activation of the antislip regulation at this at least one axle with brake slip and the braking work which is actually performed at this at least one axle with brake slip;

f) identifying from the list at least one axle without brake slip or with a permissible degree of brake slip and by means of which a greater frictional force can be transmitted than by the axle with brake slip; and

g) applying the brakes at the at least one axle without brake slip or with a permissible degree of brake slip, in such a way that the braking work which is lost at the at least one axle with brake slip is at least partially compensated.

2. The method of claim 1, wherein the compensation of the braking work which is lost at the at least one axle with brake slip takes place during the braking immediately after the operation f) or even during the braking, but a predetermined time period after the operation f).

3. The method of claim 1, wherein a variable representing the braking work is used for the calculation.

4. A friction brake system of a railway vehicle or of a rail vehicle train which is composed of a plurality of rail vehicles and which has a number of braked axles, comprising:

brake actuators on at least two selected axles of the number of braked axles which are subjected during braking by means of a control unit to a braking pressure which exceeds a braking pressure corresponding to the braking requirement for the braking;

sensors for measuring at least one variable representing the maximum transmittable frictional force in each case between the wheels of the selected axles and the rail, such as the wheel rotational speed, wheel circumferential acceleration, braking force, braking torque or braking pressure, and for transferring the variable to an electronic control unit;

a control unit that a list in which the selected axles are assigned to their respectively transmittable frictional force,

identifies at least one axle with brake slip from the selected axles at which, during braking, a brake slip which exceeds a predefined degree occurs and therefore the antislip regulation is activated, calculates

lost braking work at the at least one axle with brake slip from the difference between the braking work which would have been carried out without activation of the antislip regulation at this at least one axle with brake slip and the actual braking work performed at this at least one axle with brake slip, and identifies from the list at least one axle without brake slip or with a permissible degree of brake slip and by means of which a greater frictional force can be transmitted than by the axle with brake slip; and

brake actuators at the at least one axle without brake slip or with a permissible degree of brake slip, which brake actuators are applied by means of the control unit during the braking, in such a way that the braking work which is lost at the at least one axle with brake slip is at least partially compensated.

5. The friction brake system of claim 4, wherein the control unit performs the calculation using a variable representing the braking work.