2016 Citroen DS5 HYBRID alternator

Presentation of the Hybrid4 system



The Hybrid4 technology associates two
sources of power: an HDi Diesel engine, which
drives the front wheels and an electric motor,
which drives the rear wheels.
These two motors can operate alternately
or simultaneously, according to the Hybrid4
operating mode selected and the driving
conditions.
The electric motor alone provides power for
the vehicle in ZEV
(Zero Emissions Vehicle)
mode, and in AUTO
mode when running at
slow speed and under low load. The electric
motor also assists the HDi Diesel engine when
moving off, accelerating and changing gear.
The electric motor is powered by a high
voltage battery that is recharged during phases
of deceleration as well as, up to a certain
threshold, by the HDi Diesel engine.



1.
HDi Diesel engine (driving the front wheel).

2.
Electric motor (driving the rear wheels).

3.
200 V high voltage battery.

4.
Electronic power supervisor.
5.
Alternator-starter motor (Stop & Start).

6.
Electronic gearbox (ETG6).

7.
Electrical flow.

8.
Mode selector.

The electronic power super visor (4)

manages the operation of the two power units,
HDi Diesel and electric, giving priority to low
fuel consumption.
The alternator-star ter motor (5)
assures
the Stop & Start
function, which allows the
HDi Diesel engine to be put into standby when
the vehicle is at a standstill (traffic lights, a
stop, or in a traffic jam...) or during phases of
running in 100% electric mode.
The stopping and restarting of the HDi Diesel
engine is done automatically and instantly
without any action on the part of the driver.
This alternator-starter motor also provides
additional charging of the high-voltage battery
by the HDi Diesel engine, if this not sufficiently
charged, or in 4WD
mode for example.
The 12 V batter y
, located under the bonnet,
powers the vehicle's conventional electrical
system. It is used for starting the HDi Diesel
engine and the operation of the vehicle's
equipment, such as the lighting, wipers, audio
system...
This 12 V battery is recharged automatically by
the high voltage network.

11Hybrid4 system













On starting and when stationary

There is no flow of energy; the Stop & Start alternator-starter
stops and restarts the HDi Diesel engine automatically,
whatever the operating mode selected.


Energy recovery

During this phase (deceleration, braking, foot off the
accelerator, … all modes), the high voltage battery is
recharged by the electric motor/generator, then being driven by
the rear wheels.
You can maximise this energy recovery by taking your foot off
the accelerator pedal; deceleration will be less marked than
with a conventional vehicle.


100% electric

In all electric running (AUTO or ZEV modes), only the electric
motor drives the vehicle, via the rear wheels, powered by the
high voltage battery.
The display of " Zero Emission
" indicates that the HDi Diesel
engine is stopped and the vehicle is producing no CO
2.

19Hybrid4 system

















Mode selector


The selector allows the driver to select one of the four operating modes offered by the Hybrid4
system.


)
Turn the dial to the right or left; the mode selected is confirmed by illumination of the
corresponding indicator lamp.



ZEV
mode: for 100% electric running.

SPORT
mode: to make use of the maximum
per formance of the vehicle.


4WD
mode: to force 4x4 drive in conditions of
poor grip.


AUTO
mode: for everyday use and optimised
fuel consumption.
By default, the selector is in the AUTO
position when starting the Hybrid4 system, whatever
position it was in when the ignition was switched off.


AUTO mode


This mode is designed to optimise the vehicle's
fuel consumption by managing the alternate
or simultaneous operation of the two motors
according to the conditions and driving style.
When conditions allow, an adequate battery
state of charge and moderate acceleration, the
alternator-starter motor stops the HDi Diesel
engine to provide 100% electric running.

27Hybrid4 system











200 V high voltage battery


The Ni-Mh (Nickel-Metal Hydride) technology
used for the high voltage battery is suited to
the frequent partial charging and discharging
cycles related to the operation of a hybrid
vehicle.
The battery is installed close to the electric
motor, below the boot trim, behind the storage
well.


Charging


The battery recharges automatically while
travelling.
The battery is charged when the vehicle
decelerates and when going downhill, the
electric motor then becomes a generator and
conver ts kinetic energy into electrical energy
(except if the speed of the vehicle is above
70 mph (120 km/h)).
This recovery allows the use of "free" energy.
The battery may also be partially charged up
to a level of 4 to 5 bars, using the alternator-
starter motor (Stop & Start) of the HDi Diesel
engine.
The average state of charge is 4 to 5 bars, so
preser ving a margin for energy recovery when
deceleration or going downhill (free energy).

To preser ve the ser vice life of the
battery, the level of charge never
falls below 20%, even if no bars are
displayed on the gauge after ZEV

running.
Where the battery is close to maximum,
vehicle deceleration with your foot off
the accelerator pedal will be at a lower
level.
The battery charging time is very short.
Once it is discharged, following ZEV
running
or high load, the battery will reach its optimum
level of charge after around 10 minutes.

The battery is not recharged from a
mains power supply.

Access to the underbonnet

The alternator-starter motor of your Hybrid4
vehicle is also supplied at high voltage.
If the vehicle ignition has not been switched off,
there is a risk of the engine restarting at any
time.
Always ensure that the
ignition is switched off
( READY
lamp off) before
opening the bonnet.

Before doing anything under the
bonnet, you must switch off the ignition
and verify that the READY
lamp in the
instrument panel is off - risk of serious
injury!



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