Brake system and braking method for a rail vehicle
A rail vehicle brake system includes a brake controller with a first brake control unit providing braking functions and outputting a force manipulated variable, and a first actuator control unit providing functions for generating a frictional braking force based on the force manipulated variable and outputting an actuation variable. The brake system further includes an extension function support and an actuator that includes a second brake control unit providing braking functions and outputting a force manipulated variable, a second actuator control unit providing functions for generating a frictional braking force based on the force manipulated variable and outputting an actuation variable, a braking force unit providing functions for generating a frictional braking force based on the actuation variable, and first and second braking paths from functions that are active between a control input by the brake system and the generation of a braking force.
1 . A brake system for a rail vehicle, the brake system comprising:
a brake controller with a first brake control unit configured to provide braking functions of a service braking path and to output a force actuating variable;
an enhancement function carrier configured to receive sensor variables, to implement situation-dependent enhancement functions, and to output an enhancement variable to the first actuator control unit;
a first actuator control unit configured to provide functions for generating a frictional braking force based on the force actuating variable and the enhancement variable and to output a first actuating variable;
an actuator which has a second brake control unit configured to provide braking functions of a safety braking path and to output a force actuating variable in response to a detection of failure or incorrect behavior of the first brake control unit;
a second actuator control unit configured to provide functions for generating a frictional braking force based on the force actuating variable and to output an second actuating variables;
a braking force unit configured to provide functions for generating a frictional braking force based on one of the second actuating variables;
wherein the service first-braking path consisting of functions that are active between a control input of the brake system and the generation of braking force;
wherein the safety braking path consisting of functions that are active between control inputs of the brake system and the generation of braking force; and
wherein the service braking path is-configured to provide braking functions with low safety integrity, the safety braking path is configured to provide braking functions with high safety integrity, and the low safety integrity is lower than the high safety integrity.
2 . The brake system of claim 1 , wherein the braking force unit, includes a first group of shared functional parts which are part of the service braking path and part of the safety braking path and are configured to generate a frictional force such that the rail vehicle is decelerated.
3 . The brake system of claim 1 , wherein the enhancement function carrier is further configured to provide additional braking functions of the safety braking path.
4 . The brake system of claim 1 , wherein;
the first actuator control unit is configured to receive force actuating variables and to output actuating variables;
the second brake control unit is configured to receive a force actuating variable and an enhancement variable and a switching command and to output a force actuating variable or a switching command;
the second actuator control unit is configured to receive a force actuating variable and a switching command and to output one of the second actuating variables or a switching command; and
the braking force unit is configured to receive the switching command or one of the second actuating variables.
5 . The brake system of claim 1 , wherein
the first brake control unit and the first actuator control unit are configured to provide braking functions of the service braking path;
the second brake control unit and the second actuator control unit are configured to provide braking functions of the safety braking path; and
the braking force unit is configured to provide braking functions of the service braking path and the safety braking path.
6 . The brake system of claim 1 , wherein
the brake system furthermore comprises a power supply unit which is configured to supply the components of the brake system with power, for their operation.
7 . The brake system of claim 6 , wherein
the first brake control unit, the second brake control unit, the first actuator control unit, the second actuator control unit, the power supply unit or the braking force unit is configured to receive a switching signal and, upon receiving the switching signal, to switch from the service braking path to the safety braking path, or to switch from the safety braking path to the service braking path.
8 . The brake system of claim 1 , wherein
the first brake control unit, the second brake control unit, the first actuator control unit, the second actuator control unit, the power supply unit or the braking force unit has a switching unit and is configured to determine a switching state; and
to output a switching signal when a switching state is determined.
9 . The brake system of claim 1 , wherein the brake system is configured to perform a safety function.
10 . The brake system of claim 9 , wherein the safety function is one from the group of safety functions comprising the elements braking path monitor, actuator monitor, supply monitor, decision maker and data storage function.
11 . The brake system of claim 9 , wherein
the power supply unit is configured to perform the safety function of the supply monitor and
the second brake control unit is configured to perform the safety functions of the braking path monitor, actuator monitor, data storage function and decision maker.
12 . The brake system of claim 1 , wherein
the braking force unit is configured to receive one of the second actuating variables and to control the group of functional parts in such a way that the rail vehicle is decelerated.
13 . The brake system of claim 1 , wherein the brake controller or the actuator has a power supply unit.
14 . A rail vehicle comprising the brake system of claim 1 .
15 . A braking method for a rail vehicle, the method comprising:
providing braking functions of a service braking path by a first brake control unit in a brake controller;
outputting a force actuating variable by the first brake control unit;
providing an enhancement variable to the first actuator control unit by an enhancement unit based on receiving sensor variables;
providing braking functions to generate a frictional braking force by a first actuator control unit in the brake controller, based on the force actuating variable and the enhancement variable;
outputting a first actuating variable by the first actuator control unit;
providing braking functions by a second brake control unit in an actuator;
outputting a force actuating variable by the second brake control unit of a safety braking path in response to a detection of failure or incorrect behavior of the first brake control unit;
providing braking functions to generate a frictional braking force by a second actuator control unit in the actuator based on the force actuating variable;
outputting actuating variables by the first second actuator control unit;
providing braking functions to generate a frictional braking force by a braking force unit, based on one of the actuating variable from the second actuator control units;
providing a service braking path which comprises functions that are active between control inputs of the brake system and the generation of braking force; and
providing a safety braking path which comprises functions that are active between control inputs of the brake system and the generation of braking force,
wherein the service braking path is-configured to provide braking functions with low safety integrity, the safety braking path is configured to provide braking functions with high safety integrity, and the low safety integrity is lower than the high safety integrity.
16 . The braking method of claim 15 , wherein the providing braking functions comprises:
providing braking functions of the service braking path; or
providing braking functions of the safety braking path.
17 . The braking method of claim 15 , wherein the braking functions provided by the enhancement unit in an enhancement function carrier are those of the safety braking path.
18 . The braking method of claim 15 , further comprising:
receiving sensor variables by the enhancement function carrier; and
processing of the received sensor variables by the enhancement function carrier.
19 . The braking method of claim 15 , further comprising outputting enhancement variables by the enhancement function carrier in the service braking path.
20 . The braking method of claim 15 , further comprising at least one of:
receiving an enhancement variable by the first brake control unit;
outputting a force actuating variable by the first brake control unit;
receiving a force actuating variable by the first actuator control unit;
outputting an actuating variable by the first actuator control unit;
receiving a force actuating variable or an enhancement variable by the second brake control unit;
outputting a force actuating variable or a switching command by the second brake control unit;
receiving a force actuating variable or a switching command by the second actuator control unit;
outputting an actuating variable or a switching command by the second actuator control unit; and
receiving a switching command or an actuating variable by the braking force unit.
21 . The braking method of claim 15 , further comprising:
receiving a switching signal by the first brake control unit, the second brake control unit, the first actuator control unit, the second actuator control unit, the power supply unit or the braking force unit;
switching from the service braking path to the safety braking path, or from the s safety braking path to the service braking path, in the first brake control unit, the second brake control unit, the first actuator control unit, the second actuator control unit, the power supply unit or the braking force unit.
22 . The braking method of claim 15 , further comprising:
determining a switching state by the first brake control unit, the second brake control unit, the first actuator control unit, the second actuator control unit, the power supply unit or the braking force unit;
outputting a switching signal by the first brake control unit, the second brake control unit, the first actuator control unit, the second actuator control unit, the power supply unit or the braking force unit when the switching state is determined.