Metro train now becomes the backbone of our transportation. It reduces the dependence on buses, locomotive railways, cars, and other vehicles. It becomes an important part of
Our life because of its services and high speed. We will discuss in this article how its braking system works.
What is the Regenerative Braking system?
The regenerative braking system used in electric trains and vehicles.
Regenerative braking is an energy recovery mechanism which slows a vehicle or
Object by converting its kinetic energy into a form which can be either used
Immediately or stored until needed.
In the process of the train when the train applied a brake, kinetic energy releases and the current in the motors reversed which acts as a generator.
How does it act as a generator? These brakes shift the automobile’s electric motor into
Reverse which makes it run backward, in turn slowing the car’s wheels.
While running backward, the motor also acts as an electric generator by
Creating electricity that’s delivered into the car’s batteries.
It is also called an energy-saving process because the
Regenerated electrical energy which is supplied back to the OHE is used by
Other accelerating trains in the same line.
Thus with the help of Regenerative Braking, we can use electricity in a very effective way and reduced the wear of mechanical brakes.
How the regenerative braking system work?
When we step on the brake pedal the transitional energy is converted into the rotational energy. The energy storage unit requires a unit that can handle torque and
Speed demands of the vehicle smoothly.
An ON-OFF engine control system is used. That means that the engine is ON until the
Energy storage unit has been reached desired charge capacity and then is decoupled and
Stopped until the energy storage unit charge falls below its minimum requirement.
Brake controllers are electronic device that can control brakes remotely,
Deciding when braking begins ends, and how quickly the brake needs to be applied. During the braking operation, the brake controller directs the,
Electricity produced by the motor into the batteries or capacitors.
The generator acts as an electric motor drawing electric energy from
Batteries to give extra driving force. During brake electric supply is cut off.
How Metro Braking System works?
Each bogie is equipped with a spring-applied brake caliper. Each bogie has two independent hydraulic circuits: a service circuit and an auxiliary circuit.
An electro-hydraulic module (EHM) mounted under the metro body performs simultaneously.
The electrohydraulic module contains the entire hydraulic brake activation equipment,
Consisting of hydraulic pressure generation, pressure regulation,
And electric brake control.
All components are electrically controlled and
Monitored via three independent brake control units of type HEY-C which are integrated into the EHM module.
Braking and electric control functions performed by the EHM module