PEUGEOT e-HDi STOP/START TECHNOLOGY MEDIA KIT
PEUGEOT e-HDi TECHNOLOGY
INTRODUCTION
In designing the new generation of Euro 5 HDi engines - a project in which Peugeot has
invested more than €1billion – the central objective was to develop a stop/start system
that would contribute further to the significant progress achieved in terms of lowering fuel
consumption.
There is no one-size-fits-all solution to reducing global carbon emissions and this is why
Peugeot is developing a number of complementary technologies to meet differing
customer needs in terms of use, price, driving style and performance objectives.
After studying the many available systems, Peugeot concluded that a conventional
stop/start system with a reinforced starter would not be sufficient to ensure that the Euro 5
HDi engines delivered the quality and performance that Peugeot customers have come to
expect.
The company therefore developed the e-HDi micro-hybrid concept, being introduced
initially in the 508 & 308 range. Designed primarily to bring significant reductions in both
CO2 emissions and fuel consumption, the e-HDi micro-hybrid concept combines:

A Euro 5 compliant 1.6-litre HDi engine

A stop/start system with a second-generation reversible alternator

Improved management of electrical systems with alternator control

Optimised gearbox ratios

Low-viscosity engine oil and a variable-capacity oil pump

Tyres with low rolling resistance
The first generation PSA Group stop/start system had been in production since 2004 with a
petrol engine, and was featured in models including Smart cars and Mercedes Benz A-class
and B-class vehicles. This new generation system sees the power and control electronics
integrated into the unit itself, reducing the overall size of the packaging.
On Friday October 21st 2011 the following models will be launched featuring the new eHDi technology:
Model
Engine
EU Level
Comb Cycle
CO2
kW
Nm
Trans
508 Active Sedan
1.6L e-HDi
Euro 5
4.4
115
82 @ 3600
270 @ 1750
6EGC
308 Access Hatch
1.6L e-HDi
Euro 5
4.5
119
82 @ 3600
270 @ 1750
6EGC
308 Access Wagon
1.6L e-HDi
Euro 5
5.2
135
82 @ 3600
270 @ 1750
6EGC
These new models will offer greatly reduced operational noise and high transparency in
implementation in addition to significant fuel savings and reduced emissions. Further,
users can quantify their fuel savings by viewing the timer that records total time spent with
the engine stopped on every journey.
THE PROJECT FUNDAMENTALS
The project had two fundamental requirements: more torque to enable engine restarting
quickly and quietly, and improved overall management of on-board electrical systems to
maximise fuel economy.
In adapting powertrain design Peugeot sought to optimise the system as a whole. Peugeot
also aimed to keep costs under control while ensuring the quality and reliability of engine
performance throughout the service life of vehicles.
Peugeot developed its Euro 5 powertrains on a generic platform designed to accommodate
the future requirements of the e-HDi system. The new functions associated with the e-HDi
concept were integrated within this generic platform. Example: The engine control
function, which hosts part of the electronics of the e-HDi system, enabled a reversible
alternator that Peugeot designed with partner Valeo - to have its own power electronics,
unlike the preceding version which used a separate unit.
The design of the e-HDi system involved around 500 people with expertise in engines,
platform adaptation, electricity and electronics, over three years and required an
investment of almost €300 million. As a result almost thirty patents have been filed by
PSA.
MICRO-HYBRID STOP/START TECHNOLOGY
With the stop/start system activated the engine is automatically turned off and goes to
standby mode when the vehicle is brought to a stop at traffic lights, stop signs and in traffic
jams. The engine instantly restarts when the brake pedal is released, with the vehicle
pulling away once the accelerator is pressed.
The 508 & 308 models, which will be on sale in late October in Australia, will be the first
mass-produced cars equipped with this innovative system. The system is combined with
another leading-edge technology already commercially available – the electronically
controlled manual gearbox (EGC).
Thanks to precise metering and innovative computer control, repeated stopping and
starting of the engine can reduce fuel consumption by 10 per cent in city driving, 6 per cent
in a standard combined cycle and up to 15 per cent in heavy traffic. CO2 emissions are thus
reduced in similar proportion. And drivers see the result in the dash display showing total
time spent with the engine off.
The stop/start system also helps to improve the quality of life in cities with no mechanical
noise during the times the vehicle is stopped.
Peugeot produced the stop/start system as part of its strategy to develop new
technologies to reduce fuel consumption and CO2 emissions while enhancing drivability,
and this latest development reinforces the company’s strategic focus on creating useful
technology for every day, with benefits for both customers and society as a whole. This
pragmatic approach has been systematically shown to produce quick-to-the-market, costeffective solutions.
FEATURES OF e-HDi
The main features of the e-HDi system include:
A reversible alternator supplied by Valeo, with restart power of 2.2 kW, an increase of 70
per cent on the previous generation, and integrated power electronics which, allied with a
diesel engine, constitute a world first.

Faster start-up, since average start-up torque is 50% higher than with a
conventional starter;

Quiet restarting, since torque is transmitted by a belt rather than a starter, with
significantly reduced gearing (ratios of 1:3 for the alternator and 1:40 for the
starter);

An optimised accessory panel, so drivers may witness the engine time off.

An engine adapted from the initial design stage to take into account the
requirements specific to the e-HDi system, such as the sealed air dispenser which
stops the engine smoothly and the twin engine flywheel limiting vibration on
restarting;

A function to assist the on-board electric system, called the e-booster, which boosts
the power supplied to the alternator by means of ultra-capacitors temporarily
connected in series with the battery. This technology serves a dual purpose; it
increases the energy transmitted to the alternator for fast restarting and supports
the on-board electric system by ensuring driver and passengers do not notice any
reduction in electric power when the engine is starting. Peugeot is the first
manufacturer to integrate an energy storage function using ultra-capacitors.

A function to optimise on-board electric power by recovering deceleration energy.

A sealed battery designed to withstand the high number of charge/discharge cycles
involved in stop/start operation and energy optimisation. It’s viable for 600,000
restarts.

An upgraded powertrain mounting to help reduce vibrations when stopping and
restarting.
There are also a number of sensors and functions to keep the system running smoothly:

A battery charge status monitor.

A system monitoring the vacuum level of the braking system.

A function detecting gearbox status (open driveline and gear settings).
All sensors are designed for optimised control of the stop/start function.
STOP/START ARCHITECTURE
The power and control electronics are used for the restarting and electrical power
generation functions incorporated into the power alternator, combined with a central
voltage hold device with its power and monitoring electronics, a capacitor module
comprised of very high power capacitors, as well as:

A sealed battery

A starter motor

An engine control ECU

A set of ECUs which dialogue with the engine ECU over the different vehicle
multiplexed networks (BSI, power steering, ESP, multimode gearbox, injection ECU).

Different sensors for gear lever and clutch position, brake pedal, vacuum status.
e-HDi OPERATIONAL PHASES
The stop/start principle puts the engine into standby mode when the vehicle is stationary
and restarts it immediately and transparently when required.
Under deceleration or braking to stop the vehicle, the engine goes to standby mode before
stopping completely, and the ‘ECO’ light, located in the instrument cluster screen, comes
on. This occurs when the speed drops to less than 8 km/h and the brake pedal is being
applied.
The engine is held on standby if brake pressure is maintained or, in case of a long stop, by
engaging neutral and thus relieving the driver from pressing the brake. When the brake
pedal is released or a gear is engaged the engine restarts automatically. At all times the
driver may press the ‘ECO OFF’ button to reset the function and therefore restart.
The alternator was designed by VALEO, and is called the i-Stars. The alternator is
reversible as the energy conversion between the engine and the electrical equipment
works in both directions, unlike conventional alternators.
The alternator mode enables the reversible alternator to operate in the same way as a
conventional alternator; recharging the battery when the car engine is running and
powering electrical equipment. The starter motor mode enables the reversible alternator
to operate in the same way as a starter motor, to take electrical energy from the battery in
order to provide power to the engine in order to restart.
The information given by the brake pedal dual function switch is one of the conditions
authorising engine stop and restart.
CONDITIONS THAT AFFECT e-HDi OPERATIONAL PHASES
If the external temperature is less than minus 5 degrees or over 30 degrees and there is a
request for air conditioning, stop/start is disabled.
If the temperature difference between the interior setting requested and the calculated
interior temperature is too great the engine may restart swiftly.
Release of the seat belt, the opening of a door, battery condition and the abovementioned
conditions, will all disable the stop/start function.
ENHANCED DRIVING COMFORT, FUEL SAVINGS AND
PEACE OF MIND
The presence of six speeds in the multi-mode gearbox system enables it to make optimal
use of all the qualities of the HDi FAP engine and guarantees that in both manual and
automated mode there is impeccable responsiveness and smooth operation of the
gearbox, as well as reduced fuel consumption and optimised acoustic comfort.
The design of the gearbox facilitates the use of these six speeds by the driver:

In manual mode it is sufficient to apply pressure to the paddles (or to flick the shift
lever) to shift to the desired gear. Changing gears no longer requires successive
moves of the shift lever or repeated clutch work.

In automated mode the gearbox makes optimal use of sixth gear to increase fuel
savings.
MULTI-MODE TRANSMISSION
The multi-mode transmission gives you a choice of two driving programs: regular and
sport. In sport mode the transmission leaves it longer to shift up the gears.
And when the driver wants to take over, the transmission can be controlled manually.
Nudge the Tiptronic gear lever forwards or backwards to change gear or use the paddle
shifts mounted on the steering wheel. For maximum comfort and safety, the paddles are
fixed, irrespective of the position of the steering wheel.

e-HDi is rolled out in Australia in the 508 and 308

e-HDi design has involved around 500 people over three years, and has yielded
around 30 patents, including a reversible alternator.

Power electronics integrated into a diesel engine constitute a world first

The diesel engine has been designed specifically for the e-HDi stop/start function

Ultra capacitors ensure no interruption to power during restarting

On-board electric power is optimised by recovering deceleration energy
PRICING
308 Range (Series II)
308 Access e-HDi
Access Hatch 1.6L e-HDi 6pd EGC
$29,990.00 +ORC
308 Access Wagon e-HDi
508 Range
Access Wagon 1.6L e-HDi 6spd EGC
$31,990.00 +ORC
509 Active e-HDi
Active Sedan 1.6L e-HDi 6spd EGC
$37,490.00 +ORC