CITROËN
C1
G LO S S A R Y
HIGH-PRESSURE DIRECT
INJECTION DIESEL ENGINE
Our HDi diesel engines operate with the fuel under
extremely high pressure, enabling microscopically
precise injection control. With this level of management
it’s possible to inject at different times during the same
engine stroke allowing total control over the combustion
process. This has allowed our engineers to reduce carbon
monoxide emissions by 40%, unburned hydrocarbons by
50% and engine particulates by 60%. Fuel consumption
is 20% lower than a prechamber diesel engine, resulting
in an equivalent reduction in CO
2
emissions and thanks to
the torque available at low engine speed it could be argued
that driveability is now better than in petrol engined cars.
ANTI-LOCK BRAKING
SYSTEM (ABS)
Computer-controlled braking assistance designed to
prevent the wheels from locking under extreme braking.
This enables the car to continue being steered and
therefore controlled during this braking incident. The
Citroën C1’s ABS system is further enhanced with EBA
and EBD.
ELECTRONIC BRAKEFORCE
DISTRIBUTION (EBD)
A conventional ABS system cannot account for any of the
four wheels wanting to lock more quickly than the others
(for example, two of the wheels may be on snow and two
on tarmac). EBD reads the deceleration rate of each wheel
individually and applies the ABS principles accordingly.
ISOFIX
A standardised and more simple method for installing
installed on the two rear seats.
CORNERING STABILITY
CONTROL (CSC)
When braking on a bend, the weight applied to the wheel
on the inside of the turn is less than the weight applied to
the wheel on the outside of the turn. If the braking pressure
is identical on the wheel on the inside of the turn and on
the wheel on the outside of the turn, the vehicle tends
to move straight ahead, therefore under-steering. The
CSC function distributes the pressure on the right and left
wheels in such a way as to slow the vehicle down while
guaranteeing its steerability.
VARIABLE POWER
ASSISTED STEERING
A syste m that pro vides ex tra p ower assistance fo r a vehicle’s
steering at low speeds (such as turning a sharp corner) and
less assistance during high-speed situations.
FRONT SEAT BELT
PRE-TENSIONERS
In the event of a crash, a pre-tensioner will tighten the seat
belt almost instantaneously. This reduces the load on the
occupant in a violent crash. Like airbags, pre-tensioners are
triggered by sensors in the car’s body, and use explosively
expanding gas to drive a piston that retracts the belt.
which is when a passenger slides forward under a loosely
worn seat belt.
RADIO DATA SYSTEM (RDS)
name and other information to be transmitted alongside
audio information.
ELECTRONIC STABILITY
PROGRAMME (ESP)
This is computer-controlled traction assistance and is
provided primarily through the braking systems. The ESP’s
control unit constantly compares where the driver intends
going (through the position of the steering wheel) with
where the vehicle is actually going and, if necessary, makes
speed corrections to each wheel individually through
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