Renault - New technologies for conventional engines and transmissions

Renault - New technologies for conventional engines and transmissions

18.02.2009: In its bid to achieve significant reductions in CO2 emissions, Renault is working concurrently on: - Fundamental vehicle design parameters: mass, aerodynamics (CdA), rolling resistance,

In its bid to achieve significant reductions in CO2 emissions, Renault is working concurrently on:

 - Fundamental vehicle design parameters: mass, aerodynamics (CdA), rolling resistance,

- Efficient management of electrical energy (battery recharging under braking and when decelerating) and thermal energy (to speed up the climb in engine temperature),

- Transverse technologies, including 'stop & start' which automatically cuts the engine when the vehicle is at a standstill,

- Widespread downsizing of internal combustion engines (smaller turbocharged engines are more efficient). This work covers both petrol and diesel powerplants, although the greatest scope for reducing CO2 emissions concerns petrol engines.

- More efficient manual and automatic transmissions.

The latter two points in greater detail…
The future 'modular' TCe engine range
Renault is speeding up its work on downsized petrol engines

The challenge faced by petrol engines is to deliver significantly enhanced energetic efficiency, in particular when motoring in built-up areas. Downsizing and turbocharging are two very effective solutions, as illustrated by the TCe 100 which was launched two years ago and which has emerged as a pioneer in its class (1.2 litres). Powered by this engine, Renault Clio boasts the lowest CO2 emissions of its class (i.e. 100hp petrol engines), namely 137g/km, equivalent to combined cycle fuel consumption of 5.8 litres/100km.

To maintain the competitive edge its petrol engine range enjoys, and to achieve further significant reductions in CO2 emissions, Renault is developing a family of 'modular' TCe engines.


The future 'modular' TCe family (90 to 115hp)


With the imminent switch to Euro 5 and Euro 6 legislation, petrol engines are expected to become an increasingly attractive proposition, a trend anticipated by the new family of three- and fourcylinder TCe engines. Based on a range of cubic capacities extending from 0.9 to 1.2 litres, they will replace the current normally-aspirated engines in the 1.2- to 1.6-litre bracket. These new engines, which will feature a low inertia turbocharger, will focus on power outputs of between 65 and 85kW (90 and 115hp).

Renault will go on to develop more powerful versions. The basic design of these engines will permit the use of direct fuel injection and will enable even higher specific power outputs. CO2 emissions will be cut by between 30 and 40g/km compared with the engines they replace, and certain vehicles will be able to claim CO2 emissions of less than 100g/km.

The first of these engines will be launched within the next two-and-a-half years, and Renault estimates that these powerplants will go on to account for some 85 per cent of the petrol engines it markets in Europe.

This family of modular engines is being developed within the framework of the Renault-Nissan Alliance, an approach which permits capital outlay to be shared and economies of scale to be achieved, while also allowing the development of powertrains that meet the specific needs of different regions. Renault are bringing its understanding of the European market and experience of turbocharging to the table.


The future dCi range: an all-new engine The advantages of dCi engines


Turbocharged four-stroke diesel engines equipped with common rail direct fuel injection currently stand out as the most energy-efficient solution for use in passenger cars. On average, diesel engines consume between 20 and 30 per cent less fuel than a petrol engine of an equivalent level of performance.

The range of dCi engines currently boasts first class results with regard to CO2 emissions. For example:

- Renault Twingo dCi 85 claims 104g of CO2/km (equivalent to combined cycle fuel consumption of 4.0 litres/100km).
- - New Renault Mégane Hatchback emits 118g of CO2/km (equivalent to combined cycle fuel consumption of 4.5 litres/100km).
- - Laguna dCi 110: 130g of CO2/km (combined cycle fuel consumption of 4.9 litres/100km).


Renault's engineers intend to maximize the benefits of dCi technology thanks to evolutions aimed at enabling them to comply with upcoming emissions standards and making them even more fuel efficient. Numerous vehicles powered by these new-generation dCi engines will be able to claim CO2 emissions of less than 100g/km.


New generation 1.5 dCi engines


The 1.5 dCi (Type K9K) has a special place within the diesel range, since it is the most commonly sold Renault engine, with sales in 2008 of almost 900,000 units manufactured at Valladolid (Spain) and Bursa (Turkey). Available in several versions delivering different power outputs which currently extend from 65 to 110hp, the 1.5 dCi equips several Renault models (from Twingo to Laguna) and Dacia models. Its simple design and low friction make it a particularly attractive engine in terms of the performance it delivers for its price.

Renault plans to develop in-depth modifications to this 1.5-litre, four-cylinder powerplant which is expected to emit approximately 20g/km less CO2 when introduced from 2012.


The future 1.6 dCi 130 engine


This all-new 1.6 litre engine will boast peak power of 96kW (130hp) from launch. This represents a 16 per cent reduction in cubic capacity compared with a current 1.9 litre diesel engine of the same power output. Renault will go on to develop more powerful versions. CO2 emissions will be reduced by 25g/km compared with an equivalent engine, independent of improvements made to the vehicles it equips in fields such as aerodynamic performance, rolling resistance, mass, etc.

It will be Euro 6-ready and is covered by 15 Renault patents. This engine will form the core of the brand's Csegment line-up and will also play key roles in its D-segment and van ranges. Its launch is scheduled for 2011. This project, codenamed R9M, is a Renault-Nissan Alliance joint development. 2.0 dCi engines and beyond

The new-generation 2.0 dCi engine (Type M9R) is due to be released in 2012. In the meantime, Renault will carry over its downsizing policy to cover utility vehicles with the replacement of its current 2.5-litre engines by a 2.3 dCi unit featuring the same genetic make-up as the 2.0 dCi.

The V6 dCi (Type V9X) will continue to equip the group's upper-range models.


Automatic transmissions  - Twin-clutch transmission

Conventional automatic transmissions tend to place the emphasis on gearshift quality rather than fuel consumption. The development of new automatic transmissions sees Renault pursue two objectives:

- Improved mechanical efficiency compared to that of a conventional automatic transmission (with hydraulic coupling) thanks to technologies carried over from manual gearboxes.

- profit from the ability of automatic transmissions to permit an engine to run at the most energy-efficient revs with a view to obtaining fuel consumption performance on a par with that of manual gearboxes.

Renault is poised to release a twin-clutch transmission within the next year. Twin clutch transmissions enable gears to be changed without interrupting the transmission of torque. Twinclutch transmissions also combine ride comfort (no jarring during gearshifts, no loss of traction) with CO2 emissions identical to those of a manual gearbox (a reduction of 15 per cent compared with conventional automatic transmissions).


- Julien COTTEVERTE ,Olivier FLOC’HIC -

Permanent-URL: http://www.automobilsport.com/renault-nissan-new-technologies-for-conventional-engines-transmissions-cda-battery---55877.html

18.02.2009 / MaP

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