All DRIVe models are equipped with a conventional diesel engine and manual gearbox optimised for extra-low fuel consumption. These cars are also tailored specifically for low rolling resistance and reduced air drag.
In order to reduce CO2 emissions to 104 g/km for the C30 and 107 g/km for the S40 and V50, the new DRIVe versions have been equipped with two intelligent new features. The first is a Start/Stop function that allows the engine to switch off when the car is at a standstill, whilst also maintaining comfort settings such as the air conditioning.
When the driver puts the gear lever into neutral and releases the clutch while at a standstill, the engine switches off. The next time the driver presses the clutch, the engine starts up again. This technology has reduced fuel consumption and thus CO2 emissions by 4-5% in mixed driving conditions. Start/Stop technology is particularly effective in urban traffic, when the saving can be as much as 8%.
When the car is at a standstill and the engine is switched off, some electronic systems such as the air conditioning step down to standby level in order to save fuel. However, Volvo's Start/Stop system continuously monitors the comfort level and automatically reactivates the air conditioning if, for instance, the temperature increases in the passenger compartment. The system does not set any limits for comfort-focused features such as the sound system or other facilities that the occupants will want to maintain.
This innovative monitoring system has been made possible due to an additional small battery which supports the larger battery by providing extra power. Thanks to this extra battery, Volvo's DRIVe models also feature particularly quick and smooth start-up. The audio system also remains unaffected when the starter motor is activated. The standard larger battery has also been upgraded to handle up to 175,000 Start/Stop cycles.
The second new feature in the C30, S40 and V50 DRIVe 1.6D with Start/Stop is a regenerative charge facility. This charges the battery as soon as the driver releases the accelerator or brakes while a gear is engaged. By harnessing the car's kinetic energy, the alternator does not have to use diesel fuel as a power source to recharge the car's battery. Fuel savings of between 2 and 3% have been achieved with this function.
The introduction of front-wheel drive and the new 2.4D engine to the XC60 crossover and XC70 will see CO2 figures tumble to 159 g/km. In addition to front-wheel drive, a number of improvements all help deliver the new model's competitive fuel consumption and CO2 figures. Volvo Cars' engine experts have also succeeded in reducing friction and pump losses in the diesel engine and in cutting the pressure drop in the intake and exhaust systems.
Injection pressure has increased with the latest generation of high-pressure pumps and the injection architecture has been refined with the help of a piezo-electric system. The engine now has lower compression, more efficient combustion and the latest generation of engine management software. What is more, the turbocharger has been tuned to deliver high torque from low revs. The gear ratios have also been optimised so the car can be driven economically. For instance, when driving at 62 mph in top gear, engine revs and thus also fuel consumption are significantly lower with the new powertrain.
The Volvo V70 and S80 DRIVe models will come equipped with the same powertrain – 1.6-litre diesel engine and manual gearbox – as the smaller C30, S40 and V50 but with specially tailored engine software and different ratios in third, fourth and fifth gears. The optimised powertrain is a major aid in helping Volvo's larger cars significantly cut their fuel consumption and CO2 emissions to 57.6 mpg and 129 g/km respectively.
Several other factors also contribute to the reduction in fuel consumption, for example the tyres that have been specially designed for low rolling resistance. The V70 and S80 DRIVe versions are also equipped with an electric power steering pump that delivers exactly the servo assistance the driver requires, in a precise and energy-efficient way. All DRIVe models feature this power steering system. The V70 also features a covered grille to aid aerodynamics and a lowered chassis (20 mm front, 15 mm rear).
Volvo Car's improvements to the environmental properties of its product range are not limited to the DRIVe versions. All the automatic transmissions will be 5-7% more efficient in forthcoming versions within the next two years.Volvo reveals S90 Ambience Concept
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