What is a Telematics Control Unit?
In the automotive industry, a telematics control unit (TCU) is an embedded device
onboard a car that wirelessly links the vehicle to cloud storage or other vehicles
through V2X standards over a mobile network. The Telematics Control Unit collects
telematics data from the car,
    such as location, speed, engine data, connection quality, and so on, by
connecting with various subsystems in the vehicle via data and control buses.
It may also offer in-vehicle networking via Wifi and Bluetooth, as well as the 
eCall capability in certain areas.

A Telematics Control Unit is made up of the following components:

A satellite navigation system
A microcontroller
A mobile networking unit
An external unit for cellular communication
A unit that processes electrical signals
A memory card to store valuable information
Battery module


How does a Telematics Control Unit work?
The Telematics Control Unit gathers data from the car,
    such as position, acceleration, engine data, connectivity quality, and so on,
by connecting with various subsystems in the vehicle via data and control buses.
The Telematic Control Module (TCM) is normally found behind the dash, in the center
of the car. It is also possible to find it in the trunk, back stowage, or storage
compartment of a vehicle.

Telematics Control Device (Telematics Control Unit) — The Telematics Control Unit
is an embedded in-vehicle control unit that connects with the automobile ECUs
and GPS satellites, as well as accesses telematics services via wireless
infrastructure.

The device collects GPS and other automobile signals and transmits them to a
central server through GPRS (General Packet Radio Service), 4G mobile data,
mobile network, or satellite link. The data is analyzed by the server and
presented to end-users via secure websites and apps designed for smartphones
and tablets.

Telematics can collect geolocation, acceleration, idling time, harsh acceleration
or deceleration, fuel efficiency, vehicle faults, and other data. When this data
is analyzed for particular events and patterns, it can provide keen insights
across a whole fleet.

Why use a Telematics Control Unit?
Increasing the vehicle’s connectivity by introducing additional modems and
processors to facilitate communication from the car to the cloud, infrastructure,
or other vehicles.
    Antenna power optimization through improved current sensing, diagnostics,
and noise reduction.
    Data transmission is reliable, efficient, and speedier, allowing connectivity
with other systems in the car.
    Telematics Control Unit generates a digital blueprint of every component of 
a vehicle’s operation, enabling fleet management in evaluating where enhancements
in accident prevention and driver safety regulations can be applied.
    Telematics Control Unit can help with maintenance by analyzing hours-of-use
information and planning maintenance inspections, as well as taking note of 
guarantee recovery, engine hour tracking, and service records tracking.
    Ensuring a high degree of engine health, such as battery voltage, transmission
fluid, oxygen sensor issues, and more, may assist fleet managers in cutting costs 
and keeping cars in good condition and safe.
Telematics is poised for exponential growth as new applications are developed to
make use of modern GPS units and the pervasive use of mobile devices. More fleets
are realizing the value of fleet activity detection in order to save costs, 
increase efficiency, improve accountability, and assure total compliance with 
government regulations.

Telematics will become an indispensable component of all modern fleet operations
as owners want to go beyond the bare essentials.