The choice of hybrid architecture was also guided by the search for optimal efficiency and consistency. Hybrid technology uses two power trains which can operate alternately or simultaneously:
- The HDi diesel engine operates in its most optimal operating window on longer, out-of-town journeys. A diesel engine still remains the most efficient and versatile choice to power any vehicle
The electric motor takes over from the HDi diesel engine in phases of lower power demands, particularly when pulling away, driving at low speed and decelerating (for energy recovery). These are precisely the features that characterise urban driving
Changeover from the HDi diesel engine to the electric motor occurs automatically, due to a STOP & START system which places the HDi diesel engine in standby and restarts it as and when conditions require (the operation of the accelerator pedal, low battery charge level, etc…).
The two power sources also complement each other in certain driving conditions ("boost" effect during hard acceleration, or when overtaking another vehicle, for example). The performance of the HYbrid4 is therefore directly comparable to that obtained with a single HDi diesel engine of a much higher capacity, with good levels of responsiveness backed by a real breakthrough in terms of reduced fuel consumption and CO2 emissions (around 35 % less in the combined cycle for equivalent performance).
The electric motor and its ancillary equipment (inverter, converter, etc) are fitted at the rear of the vehicle. This provides a number of advantages not only in terms of customer benefits and it also helps reduce costs and optimise the production process.
The original layout of the Hybrid4 system allows for the possibility of four-wheel drive. The HDi diesel engine drives the front wheels, while the electric motor (in the rear drive train) drives the rear wheels.
Everything is controlled electronically ("by wire") and there are no mechanical links between the front and the rear drivetrains. This gives the system many advantages over a "traditional" mechanical system.
- No structural constraints affecting the layout and design within the passenger compartment
- 4x4 and environmental-friendliness are no longer contradicting terms
The installation at the rear, of all the vehicle’s “electrical components”, has further technical and economic benefits.
Firstly, it avoids the need for any major redesign of the vehicle’s engine compartment, while also improving weight distribution. It also leaves intact the possibility of using a range of different capacity engines, for possible future introduction.
Secondly, this architecture is achieved by means of the use of a simple and compact rear module containing the electric motor, its ancillary equipment and also the rear drive train and suspension.
The costs of the rear module are, therefore, reduced because of the technical possibility of deploying the same HYbrid4 technology into different market segments, in different body shapes, etc…, regardless of the type of internal combustion engine used.
A real breakthrough in terms of reducing fuel consumption and CO2 emissions, while improving dynamic performance levels, providing four-wheel drive and an electric only mode, HYbrid4 technology brings a number of benefits without compromises.
Furthermore, the driveability, safety and eco-efficiency of the system are based on simple, reasonable and consistent technological choices.
The Peugeot 3008 Crossover was chosen as the first application of this innovative technology.
The Peugeot 3008 HYbrid4 – In Detail
2.0 litre HDi FAP 163 bhp diesel engine
With a capacity of 1997 cm³, this Euro 5 engine develops a maximum power of 163 bhp at 3750 rpm and a maximum torque of 300Nm at 1580 rpm. To obtain this level of performance it uses Peugeot’s latest generation ECCS (Extreme Conventional Combustion System) combustion chamber design, a variable-geometry low-inertia turbocharger, a high-pressure injection pump allowing a maximum pressure of 2000 bar and solenoid injectors with eight apertures.
Naturally this is combined with the latest generation "octosquare" Eolys additive-enhanced diesel particulate emission filter (FAP) system.
Electronically-controlled 6-speed manual gearbox (BMP6)
The HDi diesel engine is mated to an electronically-controlled manual six-speed sequential gearbox:
- In automatic mode its electronic control helps provide significant savings in fuel consumption, compared to a traditional automatic gearbox or even a traditional manual gearbox
- It offers real driving satisfaction derived from the possibility of choosing the gear change mode at any time - manual or automatic - with either the gear lever or via controls behind the steering wheel
The gear change quality of the gearbox has been enhanced with HYbrid4 technology, as the rear electric motor is activated during gear changes to improve the smoothness of the operation, and sustains drive in between gear changes.