2015 Citroen DS5 HYBRID4 alternator

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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. M o d e s e l e c t o r .

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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-starter motor (5) assures the
Stop & Star t 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, 12 V batter y , located under the bonnet, 12 V batter y
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
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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 ZEV modes), only the electric ZEVmotor 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 CO2.

19Hybrid4 system
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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.
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
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200 V high voltage battery
The 200 V high voltage battery is specially made for partial, rapid and frequent charging and discharging. Of Ni-MH (Nickel Metal Hydride) technology, it is located below the boot floor, close to the electric motor.
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 converts 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 preserving a margin for energy recovery when deceleration of going downhill (free energy).
To preserve the service life of the battery, the level of charge never falls below 20%, even if a level of 0 bars is displayed after ZEV running. Where the battery is close to maximum, vehicle deceleration with your foot off the accelerator pedal will be at a lower l e v e l .
The battery charging time is very short. A discharged battery (following ZEV running or high load, for example) will quickly return to a state of charge sufficient (around 10 minutes) for full operation of the different hybrid modes.
The battery is not recharged from a mains power supply.

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Access to the underbonnet
The alternator-starter motor of your hybrid 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 t i m e .
Always ensure that the ignition is switched off ( RE ADY lamp off) RE ADY lamp off) RE ADYbefore opening the bonnet.
Before doing anything under the bonnet, to avoid the risk of serious injury, switch off the ignition and verify that the RE ADY lamp in the instrument RE ADY lamp in the instrument RE ADYpanel is off.
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