Brake System Overview

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Questions and Answers

What is required to release the spring-loaded brake?

  • Compressed air (correct)
  • Hydraulic pressure
  • Manual operation
  • Electrical signal

What occurs automatically in the case of a broken or defect hose?

  • The emergency release is activated
  • The brake is released
  • The system goes into standby mode
  • The brake is applied automatically (correct)

How can the fault of a broken hose be eliminated?

  • By resetting the electrical system
  • By replacing the hose
  • By manually applying the brake
  • By using the emergency release device (correct)

What must be done to ensure an emergency release can be performed on the spring-loaded brake?

<p>The shut-off cock must be shut-off (A)</p> Signup and view all the answers

Which component connects to the brake system for pressure control?

<p>Manometer (A)</p> Signup and view all the answers

What type of braking system is applied on the two bogies of the DTC/NDTC?

<p>Spring-loaded brakes (D)</p> Signup and view all the answers

What is the primary function of the emergency release device?

<p>To release the brake under fault conditions (B)</p> Signup and view all the answers

What must be ensured about the emergency release system during maintenance?

<p>The shut-off cocks are operational (C)</p> Signup and view all the answers

What component is responsible for holding the spring-loaded brake in place?

<p>Holding valve (C)</p> Signup and view all the answers

Which of these functions is the spring-loaded brake NOT responsible for?

<p>Releasing without external pressure (D)</p> Signup and view all the answers

What is the primary purpose of the joystick/brake lever in the vehicle's braking system?

<p>To perform rapid application of brakes in emergencies (A)</p> Signup and view all the answers

What function does the Brake Control Unit (BCU) serve in the braking system?

<p>It controls the brake force of the units (A)</p> Signup and view all the answers

What happens if the Brake Control Unit (BCU) fails?

<p>The TCU will take over the functions of the BCU (B)</p> Signup and view all the answers

What is the function of the indirect brake in the vehicle's braking system?

<p>It serves as a fallback system (D)</p> Signup and view all the answers

How does the electric brake system operate regarding brake force?

<p>It returns the generated brake force back into the network (C)</p> Signup and view all the answers

What occurs to the brake current if the brake force cannot be fed back into the network?

<p>It is commutated to a brake resistance (B)</p> Signup and view all the answers

Which component acts on all four axles of the DTC/NDTC for securing parked units?

<p>Spring-loaded brake (D)</p> Signup and view all the answers

At what speed is the pneumatic brake already connected to the system?

<p>15 km/h (A)</p> Signup and view all the answers

What does special brake blending refer to in the braking system?

<p>Proportional reduction of the electronic brake while increasing the pneumatic brake (D)</p> Signup and view all the answers

What must the driver do if the spring-loaded brake is locked due to a fault?

<p>Release the brake by hand via the emergency release device (D)</p> Signup and view all the answers

What is the role of the TCU in the braking system?

<p>To control the brake force if the BCU fails. (A)</p> Signup and view all the answers

What happens to the magnetic drag when the brake current is commutated to a brake resistance?

<p>It reduces to 0 kN within 1 second. (D)</p> Signup and view all the answers

Which brake system is primarily utilized by the vehicle for regular operation?

<p>Electric brake system. (A)</p> Signup and view all the answers

At what speed does the electronic brake force begin to decrease in the braking system?

<p>Between 15 to 3 km/h. (D)</p> Signup and view all the answers

What is the purpose of the two automatic brake valves in the braking system?

<p>To provide redundancy for brake force application. (C)</p> Signup and view all the answers

What does the term 'special brake blending' refer to?

<p>The proportional reduction of electronic brake while increasing compressed-air brake. (B)</p> Signup and view all the answers

Which brake system is utilized for securing parked units in the vehicle?

<p>Spring-loaded brake system. (A)</p> Signup and view all the answers

What must be manually operated if the spring-loaded brake is locked?

<p>The emergency release device. (C)</p> Signup and view all the answers

What component manages the brake force in normal operation?

<p>Brake Control Unit (BCU). (C)</p> Signup and view all the answers

What is the primary function of the electrical brake in the vehicle's braking system?

<p>To return brake force to the contact line network (OHE). (C)</p> Signup and view all the answers

What is the main purpose of the spring-loaded brake in the braking system?

<p>To secure the units when not in operation (C)</p> Signup and view all the answers

What action is required for the emergency release of the spring-loaded brake?

<p>Use a funicular traction on the bogie (D)</p> Signup and view all the answers

What is a consequence of a fault in a hose connected to the spring-loaded brake?

<p>The spring-loaded brake cannot be applied after a fault (B)</p> Signup and view all the answers

Which component is responsible for providing pressure control in the spring-loaded brake system?

<p>Solenoid valve (C)</p> Signup and view all the answers

What should always be ensured concerning the shut-off cock of the spring-loaded brake?

<p>It must always remain shut-off for an emergency release (C)</p> Signup and view all the answers

Which part of the spring-loaded brake system requires compressed air to function correctly?

<p>Compressed-air brake cylinder (C)</p> Signup and view all the answers

What does the presence of a solenoid valve indicate in the brake system?

<p>Electronic control is implemented for pressure regulation (C)</p> Signup and view all the answers

How does the spring-loaded brake respond in the event of a hose failure?

<p>It applies automatically as a safety measure (D)</p> Signup and view all the answers

In the context of emergency releases, what does the term 'funicular traction' refer to?

<p>A type of manual override mechanism (D)</p> Signup and view all the answers

What role does the air reservoir play in the braking system?

<p>To store air required for releasing the spring-loaded brake (D)</p> Signup and view all the answers

What is primarily used for braking the vehicle under normal conditions?

<p>Joystick/brake lever (B)</p> Signup and view all the answers

Which system takes over when the Brake Control Unit (BCU) fails?

<p>Train Control Unit (TCU) (C)</p> Signup and view all the answers

What mechanism is used to secure parked units effectively?

<p>Spring-loaded brake (B)</p> Signup and view all the answers

What happens to the brake current when it cannot be fed back into the network?

<p>It is commutated to brake resistance (A)</p> Signup and view all the answers

At what speed does the electronic brake force begin to reduce?

<p>15 km/h (B)</p> Signup and view all the answers

What action is required if the spring-loaded brake is locked due to a fault?

<p>Release the brake manually via emergency device (C)</p> Signup and view all the answers

What is special brake blending?

<p>Proportional reduction of electronic brake while increasing pneumatic brake (A)</p> Signup and view all the answers

Which component serves as a fallback for brake application in case of BCU failure?

<p>Indirect brake with automatic valves (A)</p> Signup and view all the answers

What happens to the magnetic drag within one second of commutating brake current to brake resistance?

<p>It reaches zero (B)</p> Signup and view all the answers

At which speed does the pneumatic brake get connected to the system?

<p>15 km/h (D)</p> Signup and view all the answers

Which statement is true about the spring-loaded brake system?

<p>It automatically applies when there is a defect in the system. (B)</p> Signup and view all the answers

What type of brake cylinder is used in conjunction with the spring-loaded brake?

<p>Pneumatic brake cylinder (C)</p> Signup and view all the answers

What is required in the case of manually activating the emergency release?

<p>One funicular traction per brake must be applied. (A)</p> Signup and view all the answers

What consequence occurs if a fault is detected in the spring-loaded brake system?

<p>The spring-loaded brake cannot be applied. (C)</p> Signup and view all the answers

Which component is crucial for holding the spring-loaded brake in place?

<p>Holding valve (D)</p> Signup and view all the answers

What action must be executed to ensure the emergency release of the spring-loaded brake can be performed?

<p>Shut-off cock must be turned on. (D)</p> Signup and view all the answers

What is the primary role of the solenoid valve in the brake system?

<p>It regulates the airflow to the brake cylinder. (A)</p> Signup and view all the answers

What must be ensured regarding the air reservoir in the spring-loaded brake setup?

<p>It must maintain sufficient pressure for brake function. (D)</p> Signup and view all the answers

What happens to the system if the shut-off cock of the spring-loaded brake is left open during an emergency?

<p>Emergency release will be inefficient. (A)</p> Signup and view all the answers

Which device is specifically designed for emergency scenarios in the braking system?

<p>Emergency release device (A)</p> Signup and view all the answers

Flashcards

Electric Brake

This system primarily utilizes electric braking, allowing the generated braking force to be returned to the overhead contact line network (OHE).

Pneumatic Brake

An auxiliary braking system that functions by applying air pressure to brake calipers. It plays a significant role in managing braking forces during transitions and low-speed scenarios.

Auxiliary Brake Systems (EP, Spring-Loaded)

These specialized brake systems operate independently of the main electric brake system and serve as a backup in case of failure.

Brake Control Unit (BCU)

A dedicated unit that regulates the braking force applied to the wheels. This unit ensures optimal braking performance.

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Special Brake Blending

This feature allows for the gradual transition of braking responsibility from the electric system to the pneumatic system as the train slows down.

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Joystick/Brake Lever (Emergency Mode)

Emergency braking lever that allows for immediate application of the brakes for urgent situations.

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Spring-Loaded Brake

A safety mechanism that retains the train in a stationary position using spring pressure applied to the wheels.

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Indirect Brake with Automatic Brake Valves

A backup mechanism that provides basic braking capabilities in the event of a BCU malfunction. This system can be independently controlled by the driver or the guard.

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Automatic EP Brake Reduction

The process where the brake system automatically reduces the electronic braking force at low train speeds, usually below 3 km/h.

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Overhead Contact Line Network (OHE)

The overhead contact line network (OHE) plays a crucial role in electric traction by providing power to the train through an overhead wire system.

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Manometer

The pressure in the brake system is measured using this device.

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Emergency Release Device

This device allows for manual release of the spring-loaded brake in case of a fault.

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Shut-off Cock

This valve prevents air from flowing through the system when it is closed.

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Air Reservoir

A part of the brake system that holds the pressure, similar to a storage tank for air.

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Brake Cylinder

This device connects the brake cylinders and helps apply pressure.

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Spring-loaded Brake Application

The spring-loaded brake is used to secure train units, typically applied to both bogies.

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Holding Valve

This device helps prevent the system from losing air in case of a leak, preventing the brake from automatically applying.

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Bogies

The spring-loaded brake system acts on both of these, which are the wheeled structures of the train.

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BP Connection

This device helps connect the spring-loaded brake system to the train's compressed air source.

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Brake Control (BCU)

A unit responsible for controlling the braking force of the train, managing optimal braking performance. In case of failure, the TCU takes over its functions.

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Spring-loaded Brake Application (Action)

The mechanism that ensures the spring-loaded brake remains applied until compressed air acts on it.

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Joystick/Brake Lever

This lever, also known as the master controller, is used to brake the train and can be quickly applied in emergencies using EP brake.

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Indirect Brake

This system acts as a fallback if the primary brake units fail.

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Automatic Brake Valves

A device provided for both the driver and the guard, the indirect brake can be operated through these.

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What is the purpose of the Spring Loaded Brake?

A braking system that uses compressed air to apply brakes. It works by releasing the brakes with compressed air and applying them when there is no air pressure.

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What is the BP connection used for?

The Spring Loaded Brake is connected to this device to release the brake.

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What is the function of the Holding Valve?

This mechanism is responsible for preventing an automatic application of the brakes if there is a leak in the system.

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Where is the Spring Loaded Brake system applied?

The Spring Loaded Brake system is specifically designed to operate on the two wheeled structures of the train.

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What allows the Spring Loaded Brake to be released manually in case of a malfunction?

This allows the Spring Loaded Brake to be manually released in case of a malfunction.

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Why is the Spring Loaded Brake used?

The Spring Loaded Brake acts as a safety mechanism to secure the train units.

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What is the Manometer used for?

This device is responsible for monitoring the pressure in the brake system.

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What is the role of the Shut-off Cock in the Spring Loaded Brake system?

This valve plays a crucial role in preventing air flow through the system when closed, ensuring the Spring Loaded Brake can be engaged.

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What is the function of the Air Reservoir in the Spring Loaded Brake system?

This is a main component of the brake system and stores the pressurized air used for braking.

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What are the Brake Cylinders used for in the Spring Loaded Brake system?

The Spring Loaded Brake is connected to these which act as the main components that apply the braking force.

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Study Notes

Brake System Overview

  • The vehicle uses several brake systems, primarily the joystick/brake lever for normal braking and a rapid emergency application.
  • The EP brake system is used, with one Brake Control Unit (BCU) per unit.
  • If the BCU fails, the TCU will take over its functions.
  • A backup indirect brake system, operated by two automatic brake valves (one for the driver, one for the guard), is also present.
  • The primary brake type is electric, allowing brake force return to the contact line network (OHE).
  • If network return isn't possible, the brake current is routed through a resistance, reducing magnetic drag to 0 kN within 1 second.
  • An electro-pneumatic brake system handles magnetic drag after that.
  • A spring-loaded brake system secures parked units across all axles of the DTC/NDTC.
  • Application and release of the spring-loaded brake is via push buttons in the driver's cab.
  • An air shut-off cock secures the brake in case of fault, requiring manual emergency release.
  • Pneumatic brake activation begins at 15 km/h, with electronic brake force reduction dependent on speed (15-3 km/h) and automatic reduction below 3 km/h.
  • "Special brake blending" is the proportional reduction of electronic braking as compressed-air braking is increased.

Brake System Details

  • Diagrams and figures detail specific components, schematics, connections, and specific components in the brake systems, including EP units, BCU/SKS, Analog Input, Triple Valves, and Stabilising Valves.
  • Diagrams show components like pressure ranges, specifying pressures of 3.6 bar and 1.6 bar.
  • Different configurations are shown in diagrams: DTC – MC – TC, and NDTC – MC – TC
  • Detailed diagrams show the relationships between these components.

Additional Notes

  • Multiple diagrams illustrate the brake system components, connections, and operation, including vehicle configurations such as DTC–MC–TC and NDTC–MC–TC setups.
  • The spring-loaded brake system acts on all axles of the DTC/NDTC .
  • In case of a broken hose, the spring-loaded brake applies automatically. A shut-off valve is necessary for emergency release.
  • A special lever-based emergency release exists for the spring-loaded brake, activated via a shut-off cock.

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