E-Class / GLEMercedesBenz

Mercedes E-Classのエンジンがバージョンアップ

Eクラスのエンジンがさらにパワフルに、さらにエフィシエンシーに。メルセデスはEクラスのエンジンラインアップを刷新することを発表しました。E350 BlueEFFICIENCYに搭載される3.5リッターV6は、最高出力302hpトルクは370Nmとなり、13hpと5Nmのパワーアップとなります。新型のCLSに搭載されたユニットです。

特筆すべきは、環境性能です。燃費とCO2排出量が約20%削減されているようです。燃費は13〜15km/リッターとなり、CO2排出量は159〜164g/kmになります。
最上位クラスのE500 BlueEFFICIENCYは、新開発の4.8リッタ−V8のツインターボを搭載し、最高出力が402hp、トルクが600Nmとなります。前モデルと比べ20hpと70Nmのパワーアップとなります。燃費は17%改善しており、燃費は約11km/リッターとなります。

この環境性能の大幅向上を担っているのは、大きく3つのテクノロジーです。一つが、高噴射圧のピエゾインジェクターによりリーンバーンを可能とした最先端技術「BlueDIRECTテクノロジー」を搭載したこと、そして新たに搭載されたアイドリングストップ機構、最後にトランスミッションが7G-TRONIC PLUSにアップデートされたことです。
直噴リーンバーンは、BMWも積極的に使っている技術であり、現在最もトレンディーなエンジン技術の一つと言えます。このピエゾインジェクターですが、BMWとシーメンスで共同開発された技術で、メルセデスも積極的に採用をし始めています。
BMW&シーメンスのリーンバーンが優れているのは、低速トルクが犠牲になっていない点です。これはBMW 320iで証明されたのではないでしょうか。BMWとメルセデスは、このリーンバーンを最も重要な基幹技術の一つと位置づけているはずです。まだまだ進化するのでしょう。
一方、フォルクスワーゲン&アウディ連合のアプローチであるダウンサイジングコンセプトのエンジン(TFSIなど)は、リーンバーンは行っていません。その理由は単純で、リーンバーンにより排出されるNOx低減のために装備する触媒やセンサーなどがクルマのコストを押し上げるからです。技術がない訳ではありません。ターボ過給の方が「安く上がる」というソロバン勘定があるのでしょう。

プレスリリース

New engines for the E-Class: E-Class more efficient than ever

With V6 and V8 petrol engines that consume up to 20 percent less fuel, Mercedes-Benz is once again raising the measuring standard for efficiency in the E-Class segment. For example the E 350 BlueEFFICIENCY with a V6 engine has a low NEDC consumption of 6.8-7.0 litres of premium petrol per 100 kilometres. This corresponds to CO2?emissions of 159-164 g/km. The combined consumption of the new V8 model E 500 BlueEFFICIENCY has fallen by 17 percent to 8.9 l/100 km (209 g/km CO2)*. All** petrol and diesel engines in the E-Class now have direct injection. The leap in efficiency achieved with the BlueDIRECT engines is supported by the ECO start/stop function, which is also standard equipment for the four-cylinder models in future. In addition all automatic versions** are equipped with the improved 7G-TRONIC PLUS 7-speed automatic transmission, which likewise contributes to fuel economy.

“The new BlueDIRECT V6 and V8 engines set previously unattained standards in the luxury class,” says Dr. Thomas Weber, the member of the Daimler AG Executive Board responsible for corporate research and development at Mercedes-Benz Cars. “With the new V6 engine in the E 350 BlueEFFICIENCY we are able to realise fuel consumption figures previously only possible for four-cylinder units. To remain at the very peak in the automotive executive class, however, Mercedes-Benz is not restricting itself to the introduction of highly efficient engines, but also using every conceivable means of saving fuel – from aerodynamics to lightweight construction, and from optimised transmissions right up to the electrification of the powertrain and peripheral units.”

BlueDIRECT: the most efficient form of direct petrol injection
The two BlueDIRECT petrol engines in the E 350 BlueEFFICIENCY and E 500 BlueEFFICIENCY represent the new generation of V6 and V8 engines, which celebrated its world premiere in the S-Class and in the CL. The centrepiece of the BlueDIRECT technology package is third-generation direct petrol injection with spray-guided combustion and an injection pressure of 200 bar. Major features:

the Multi-Spark Ignition (MSI) system, which enables up to four sparks to be triggered in rapid succession within one millisecond
latest-generation piezo injectors for up to five injections per power stroke
stratified combustion is extended with a newly developed lean-burn process (“Homogeneous Stratified”), which greatly widens the characteristic map for fuel-efficient lean-burn combustion in the V6 engine. The first fuel spray is injected on the intake stroke, whereupon a homogeneous basic mixture is formed. The actual “stratified” injection takes place on the compression stroke prior to ignition, and is map-dependently controlled in the form of a single or double injection.
E 350 BlueEFFICIENCY: the most fuel-efficient petrol model in its class
The 3.5-litre V6 engine of the E 350 BlueEFFICIENCY is naturally aspirated. As a major distinction from the preceding engine, the V-angle between the cylinder banks has been reduced from 90 degrees to 60 degrees. This has enabled the balancer shaft compensating primary vibrations to be omitted. As a result the driver notices an outstanding level of comfort. Another feature is the completely new air intake system with a variable-resonance intake manifold. The wealth of innovations has a positive effect on both performance and fuel consumption: with the same displacement, the output of the E 350 BlueEFFICIENCY has increased from 215 kW (292 hp) to 225 kW (306 hp), with maximum torque increased to 370 newton metres (previously 365 Nm) and available over a wide engine speed range from 3500 to 5250 rpm.

At the same time Mercedes engineers have achieved a remarkable reduction in fuel consumption. The NEDC consumption of the preceding model (8.5 litres of premium petrol per 100 kilometres) has been reduced by one fifth. The new V6 petrol engine of the E 350 BlueEFFICIENCY consumes only 6.8-7.0 l/100 km (E 350 4MATIC BlueEFFICIENCY: 7.4-7.5 l/100km)*. This corresponds to a saving of 1.7 litres or 20 percent, and makes the E 350 BlueEFFICIENCY the most fuel-efficient petrol model in its performance class. CO2 emissions have likewise fallen by 20 percent, from 199 to 159-164 g/km (E 350 4MATIC BlueEFFICIENCY: 174-176 g CO2/km)*.

The E 350 BlueEFFICIENCY combines its excellent fuel economy with dynamic performance. Acceleration from zero to 100 km/h takes just 6.3 seconds (E 350 4MATIC BlueEFFICIENCY: 6.6 s)*. Maximum speed is 250 km/h (electronically limited).

E 500 BlueEFFICIENCY: more power with far lower fuel consumption
While the V6 engine is a naturally aspirated unit, the new V8 engine of the E 500 BlueEFFICIENCY for the first time features twin turbocharging, which was previously only familiar from the 12-cylinder S-Class and CL. Despite a significantly smaller displacement (4633 cc, previously 5461 cc), the eight-cylinder has gained in both output (300 kW/408 hp, previously 285 kW/388 hp) and torque (600 Nm, previously 530 Nm). At the same time fuel consumption has fallen by around 17 percent, from 10.8 to 8.9 l/100 kilometres (E 500 4MATIC BlueEFFICIENCY: 9.4 l/100km)*. CO2-emissions have fallen to the same extent, from 253 to 209 g/km (E 500 4MATIC BlueEFFICIENCY: 219 g/km)*. These figures make the new E 500 BlueEFFICIENCY the executive saloon with the lowest fuel consumption in its performance class.

The excellent efficiency goes hand in hand with superior performance: the E 500 BlueEFFICENCY and the E 500 4MATIC BlueEFFICIENCY sprint from zero to 100 km/h in 5.2 seconds. Top speed is 250 km/h (electronically limited).

Both the new V6 and the new V8 from Mercedes-Benz have aluminium crankcases, pistons and cylinder heads. The crankshaft, connecting rods and valves are of special forged steel. Thanks to systematic lightweight design and intensive fine-tuning of details, engine friction has also been reduced by 28 percent compared to the previous engine.

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